diff --git a/app/models/__init__.py b/app/models/__init__.py
index e69de29..d482f26 100644
--- a/app/models/__init__.py
+++ b/app/models/__init__.py
@@ -0,0 +1,24 @@
+"""SQLModel model definitions for SneakySwole.
+
+All 8 tables are defined here and re-exported for convenient imports.
+"""
+
+from app.models.user import User
+from app.models.exercise import Exercise
+from app.models.warmup import Warmup
+from app.models.workout_day import WorkoutDay
+from app.models.user_exercise_program import UserExerciseProgram
+from app.models.workout_session import WorkoutSession
+from app.models.workout_log import WorkoutLog
+from app.models.progress_log import ProgressLog
+
+__all__ = [
+    "User",
+    "Exercise",
+    "Warmup",
+    "WorkoutDay",
+    "UserExerciseProgram",
+    "WorkoutSession",
+    "WorkoutLog",
+    "ProgressLog",
+]
diff --git a/app/models/exercise.py b/app/models/exercise.py
new file mode 100644
index 0000000..7ed3c5a
--- /dev/null
+++ b/app/models/exercise.py
@@ -0,0 +1,35 @@
+"""Exercise model for the exercise library catalog.
+
+Each exercise belongs to a workout day and includes form cues.
+"""
+
+from datetime import datetime
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class Exercise(SQLModel, table=True):
+    """An exercise in the workout library.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        name: Exercise name (e.g., "DB Chest Press (Floor)").
+        muscle_group: Target muscle group (e.g., "Chest", "Shoulders").
+        workout_day: Which day this exercise belongs to (Push/Pull/Lower/Full Body).
+        sets: Default number of sets.
+        tempo: Tempo notation (e.g., "3-1-2" = 3s eccentric, 1s pause, 2s concentric).
+        form_cues: Detailed form instructions.
+        created_at: Timestamp when the record was created.
+    """
+
+    __tablename__ = "exercises"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str = Field(index=True)
+    muscle_group: str = Field(default="")
+    workout_day: str = Field(index=True)
+    sets: int = Field(default=3)
+    tempo: str = Field(default="")
+    form_cues: str = Field(default="")
+    created_at: datetime = Field(default_factory=datetime.utcnow)
diff --git a/app/models/progress_log.py b/app/models/progress_log.py
new file mode 100644
index 0000000..b1bad35
--- /dev/null
+++ b/app/models/progress_log.py
@@ -0,0 +1,39 @@
+"""ProgressLog model for tracking progression suggestions and outcomes.
+
+Records what the progression engine suggested vs what the user actually did.
+"""
+
+import datetime as dt
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class ProgressLog(SQLModel, table=True):
+    """A progression tracking entry for a specific exercise.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        user_id: FK to users table.
+        exercise_id: FK to exercises table.
+        date: The date this progression entry applies to.
+        suggested_reps: What the engine recommended.
+        suggested_weight: What the engine recommended.
+        actual_reps: What the user actually did.
+        actual_weight: What the user actually used.
+        progression_applied: Type of progression (e.g., "reps_increase", "weight_increase", "deload").
+        created_at: Timestamp when the record was created.
+    """
+
+    __tablename__ = "progress_log"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    user_id: int = Field(foreign_key="users.id", index=True)
+    exercise_id: int = Field(foreign_key="exercises.id")
+    date: dt.date = Field(default_factory=dt.date.today)
+    suggested_reps: Optional[int] = Field(default=None)
+    suggested_weight: Optional[str] = Field(default=None)
+    actual_reps: Optional[int] = Field(default=None)
+    actual_weight: Optional[str] = Field(default=None)
+    progression_applied: Optional[str] = Field(default=None)
+    created_at: dt.datetime = Field(default_factory=dt.datetime.utcnow)
diff --git a/app/models/user.py b/app/models/user.py
new file mode 100644
index 0000000..41f831b
--- /dev/null
+++ b/app/models/user.py
@@ -0,0 +1,39 @@
+"""User model for profile management.
+
+Stores admin and regular user profiles with physical stats and goals.
+"""
+
+from datetime import datetime
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class User(SQLModel, table=True):
+    """A user profile in the system.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        username: Unique login identifier.
+        password_hash: bcrypt-hashed password (admin only initially).
+        display_name: Human-readable name shown in the UI.
+        height: User's height as a string (e.g., "6'0\"").
+        weight: User's weight as a string (e.g., "260 lbs").
+        goals: Free-text training goals.
+        is_admin: Whether this user has admin privileges.
+        created_at: Timestamp when the record was created.
+        updated_at: Timestamp of the last update.
+    """
+
+    __tablename__ = "users"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    username: str = Field(index=True, unique=True)
+    password_hash: str = Field(default="")
+    display_name: str = Field(default="")
+    height: Optional[str] = Field(default=None)
+    weight: Optional[str] = Field(default=None)
+    goals: Optional[str] = Field(default=None)
+    is_admin: bool = Field(default=False)
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    updated_at: datetime = Field(default_factory=datetime.utcnow)
diff --git a/app/models/user_exercise_program.py b/app/models/user_exercise_program.py
new file mode 100644
index 0000000..eb46dd5
--- /dev/null
+++ b/app/models/user_exercise_program.py
@@ -0,0 +1,37 @@
+"""UserExerciseProgram model for per-user exercise programming.
+
+Links a user to an exercise with week 1 and week 4 rep/weight targets.
+"""
+
+from datetime import datetime
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class UserExerciseProgram(SQLModel, table=True):
+    """Per-user programming for a specific exercise.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        user_id: FK to users table.
+        exercise_id: FK to exercises table.
+        wk1_reps: Week 1 target reps (string to support "30 sec" style).
+        wk4_reps: Week 4 target reps.
+        wk1_weight: Week 1 target weight (e.g., "30 lbs", "BW").
+        wk4_weight: Week 4 target weight.
+        created_at: Timestamp when the record was created.
+        updated_at: Timestamp of the last update.
+    """
+
+    __tablename__ = "user_exercise_programs"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    user_id: int = Field(foreign_key="users.id", index=True)
+    exercise_id: int = Field(foreign_key="exercises.id", index=True)
+    wk1_reps: str = Field(default="")
+    wk4_reps: str = Field(default="")
+    wk1_weight: str = Field(default="")
+    wk4_weight: str = Field(default="")
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    updated_at: datetime = Field(default_factory=datetime.utcnow)
diff --git a/app/models/warmup.py b/app/models/warmup.py
new file mode 100644
index 0000000..b4389db
--- /dev/null
+++ b/app/models/warmup.py
@@ -0,0 +1,33 @@
+"""Warmup model for the standardized warmup routine.
+
+Warmups are displayed before every workout in a fixed order.
+"""
+
+from datetime import datetime
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class Warmup(SQLModel, table=True):
+    """A warmup exercise in the standardized routine.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        name: Warmup name (e.g., "Cat / Cow").
+        type: Category (e.g., "Thoracic Mob", "Hip Mobility").
+        reps: Rep scheme as a string (e.g., "8 reps", "8 each side").
+        form_cues: Detailed form instructions.
+        sort_order: Display order in the warmup sequence.
+        created_at: Timestamp when the record was created.
+    """
+
+    __tablename__ = "warmups"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str = Field(index=True)
+    type: str = Field(default="")
+    reps: str = Field(default="")
+    form_cues: str = Field(default="")
+    sort_order: int = Field(default=0)
+    created_at: datetime = Field(default_factory=datetime.utcnow)
diff --git a/app/models/workout_day.py b/app/models/workout_day.py
new file mode 100644
index 0000000..a3aab1c
--- /dev/null
+++ b/app/models/workout_day.py
@@ -0,0 +1,26 @@
+"""WorkoutDay model for the 4-day training split.
+
+Defines the named workout days and their order.
+"""
+
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class WorkoutDay(SQLModel, table=True):
+    """A named workout day in the training program.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        name: Day name (Push, Pull, Lower, Full Body).
+        day_number: Order in the weekly rotation (1-4).
+        description: Brief description of the day's focus.
+    """
+
+    __tablename__ = "workout_days"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str = Field(index=True, unique=True)
+    day_number: int = Field(unique=True)
+    description: str = Field(default="")
diff --git a/app/models/workout_log.py b/app/models/workout_log.py
new file mode 100644
index 0000000..0a39cad
--- /dev/null
+++ b/app/models/workout_log.py
@@ -0,0 +1,37 @@
+"""WorkoutLog model for per-exercise set logging.
+
+Each log entry records one set of one exercise within a session.
+"""
+
+from datetime import datetime
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class WorkoutLog(SQLModel, table=True):
+    """A single set log for an exercise within a workout session.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        session_id: FK to workout_sessions table.
+        exercise_id: FK to exercises table.
+        set_number: Which set this is (1, 2, 3...).
+        reps_completed: Actual reps performed.
+        weight_used: Weight used as string (e.g., "30 lbs", "BW").
+        felt_easy: Whether the user felt the set was easy (progression signal).
+        notes: Optional notes about this specific set.
+        created_at: Timestamp when the record was created.
+    """
+
+    __tablename__ = "workout_logs"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    session_id: int = Field(foreign_key="workout_sessions.id", index=True)
+    exercise_id: int = Field(foreign_key="exercises.id")
+    set_number: int = Field(default=1)
+    reps_completed: int = Field(default=0)
+    weight_used: str = Field(default="")
+    felt_easy: bool = Field(default=False)
+    notes: Optional[str] = Field(default=None)
+    created_at: datetime = Field(default_factory=datetime.utcnow)
diff --git a/app/models/workout_session.py b/app/models/workout_session.py
new file mode 100644
index 0000000..acf1606
--- /dev/null
+++ b/app/models/workout_session.py
@@ -0,0 +1,31 @@
+"""WorkoutSession model for tracking completed workout sessions.
+
+Each session ties a user to a workout day on a specific date.
+"""
+
+import datetime as dt
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class WorkoutSession(SQLModel, table=True):
+    """A completed workout session.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        user_id: FK to users table.
+        workout_day_id: FK to workout_days table.
+        date: The date the workout was performed.
+        notes: Optional free-text notes about the session.
+        created_at: Timestamp when the record was created.
+    """
+
+    __tablename__ = "workout_sessions"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    user_id: int = Field(foreign_key="users.id", index=True)
+    workout_day_id: int = Field(foreign_key="workout_days.id")
+    date: dt.date = Field(default_factory=dt.date.today)
+    notes: Optional[str] = Field(default=None)
+    created_at: dt.datetime = Field(default_factory=dt.datetime.utcnow)
diff --git a/tests/test_models.py b/tests/test_models.py
new file mode 100644
index 0000000..ac28cd0
--- /dev/null
+++ b/tests/test_models.py
@@ -0,0 +1,228 @@
+"""Tests for SQLModel model definitions."""
+
+from datetime import datetime
+
+from sqlmodel import SQLModel, Session, create_engine
+
+from app.models.user import User
+from app.models.exercise import Exercise
+from app.models.warmup import Warmup
+from app.models.workout_day import WorkoutDay
+from app.models.user_exercise_program import UserExerciseProgram
+from app.models.workout_session import WorkoutSession
+from app.models.workout_log import WorkoutLog
+from app.models.progress_log import ProgressLog
+
+
+class TestModels:
+    """Tests that all models can be instantiated and persisted."""
+
+    def _create_engine(self):
+        """Create an in-memory SQLite engine with all tables."""
+        engine = create_engine("sqlite:///:memory:")
+        SQLModel.metadata.create_all(engine)
+        return engine
+
+    def test_user_model_roundtrip(self) -> None:
+        """User model should persist and retrieve correctly."""
+        engine = self._create_engine()
+        user = User(
+            username="testuser",
+            password_hash="fakehash",
+            display_name="Test User",
+            height="6'0\"",
+            weight="200 lbs",
+            goals="Get strong",
+            is_admin=False,
+        )
+        with Session(engine) as session:
+            session.add(user)
+            session.commit()
+            session.refresh(user)
+            assert user.id is not None
+            assert user.username == "testuser"
+            assert user.is_admin is False
+            assert isinstance(user.created_at, datetime)
+
+    def test_exercise_model_roundtrip(self) -> None:
+        """Exercise model should persist and retrieve correctly."""
+        engine = self._create_engine()
+        exercise = Exercise(
+            name="DB Chest Press (Floor)",
+            muscle_group="Chest",
+            workout_day="Push",
+            sets=3,
+            tempo="3-1-2",
+            form_cues="Lie on the floor...",
+        )
+        with Session(engine) as session:
+            session.add(exercise)
+            session.commit()
+            session.refresh(exercise)
+            assert exercise.id is not None
+            assert exercise.name == "DB Chest Press (Floor)"
+
+    def test_warmup_model_roundtrip(self) -> None:
+        """Warmup model should persist and retrieve correctly."""
+        engine = self._create_engine()
+        warmup = Warmup(
+            name="Cat / Cow",
+            type="Thoracic Mob",
+            reps="8 reps",
+            form_cues="Start on hands and knees...",
+            sort_order=1,
+        )
+        with Session(engine) as session:
+            session.add(warmup)
+            session.commit()
+            session.refresh(warmup)
+            assert warmup.id is not None
+
+    def test_workout_day_model_roundtrip(self) -> None:
+        """WorkoutDay model should persist and retrieve correctly."""
+        engine = self._create_engine()
+        day = WorkoutDay(
+            name="Push",
+            day_number=1,
+            description="Chest, shoulders, triceps",
+        )
+        with Session(engine) as session:
+            session.add(day)
+            session.commit()
+            session.refresh(day)
+            assert day.id is not None
+            assert day.day_number == 1
+
+    def test_user_exercise_program_model_roundtrip(self) -> None:
+        """UserExerciseProgram model should persist with FK references."""
+        engine = self._create_engine()
+        with Session(engine) as session:
+            user = User(username="u", password_hash="h", display_name="U")
+            exercise = Exercise(
+                name="Test Ex", muscle_group="Test",
+                workout_day="Push", sets=3, tempo="3-1-2", form_cues="..."
+            )
+            session.add(user)
+            session.add(exercise)
+            session.commit()
+            session.refresh(user)
+            session.refresh(exercise)
+
+            program = UserExerciseProgram(
+                user_id=user.id,
+                exercise_id=exercise.id,
+                wk1_reps="8",
+                wk4_reps="12",
+                wk1_weight="30 lbs",
+                wk4_weight="40 lbs",
+            )
+            session.add(program)
+            session.commit()
+            session.refresh(program)
+            assert program.id is not None
+            assert program.user_id == user.id
+
+    def test_workout_session_model_roundtrip(self) -> None:
+        """WorkoutSession model should persist correctly."""
+        engine = self._create_engine()
+        with Session(engine) as session:
+            user = User(username="u", password_hash="h", display_name="U")
+            day = WorkoutDay(name="Push", day_number=1, description="Push day")
+            session.add(user)
+            session.add(day)
+            session.commit()
+            session.refresh(user)
+            session.refresh(day)
+
+            ws = WorkoutSession(
+                user_id=user.id,
+                workout_day_id=day.id,
+                date=datetime.utcnow().date(),
+            )
+            session.add(ws)
+            session.commit()
+            session.refresh(ws)
+            assert ws.id is not None
+
+    def test_workout_log_model_roundtrip(self) -> None:
+        """WorkoutLog model should persist correctly."""
+        engine = self._create_engine()
+        with Session(engine) as session:
+            user = User(username="u", password_hash="h", display_name="U")
+            day = WorkoutDay(name="Push", day_number=1, description="Push day")
+            exercise = Exercise(
+                name="Ex", muscle_group="Test",
+                workout_day="Push", sets=3, tempo="3-1-2", form_cues="..."
+            )
+            session.add_all([user, day, exercise])
+            session.commit()
+            session.refresh(user)
+            session.refresh(day)
+            session.refresh(exercise)
+
+            ws = WorkoutSession(
+                user_id=user.id,
+                workout_day_id=day.id,
+                date=datetime.utcnow().date(),
+            )
+            session.add(ws)
+            session.commit()
+            session.refresh(ws)
+
+            log = WorkoutLog(
+                session_id=ws.id,
+                exercise_id=exercise.id,
+                set_number=1,
+                reps_completed=8,
+                weight_used="30 lbs",
+                felt_easy=False,
+            )
+            session.add(log)
+            session.commit()
+            session.refresh(log)
+            assert log.id is not None
+            assert log.felt_easy is False
+
+    def test_progress_log_model_roundtrip(self) -> None:
+        """ProgressLog model should persist correctly."""
+        engine = self._create_engine()
+        with Session(engine) as session:
+            user = User(username="u", password_hash="h", display_name="U")
+            exercise = Exercise(
+                name="Ex", muscle_group="Test",
+                workout_day="Push", sets=3, tempo="3-1-2", form_cues="..."
+            )
+            session.add_all([user, exercise])
+            session.commit()
+            session.refresh(user)
+            session.refresh(exercise)
+
+            pl = ProgressLog(
+                user_id=user.id,
+                exercise_id=exercise.id,
+                date=datetime.utcnow().date(),
+                suggested_reps=10,
+                suggested_weight="35 lbs",
+                actual_reps=10,
+                actual_weight="35 lbs",
+                progression_applied="reps_increase",
+            )
+            session.add(pl)
+            session.commit()
+            session.refresh(pl)
+            assert pl.id is not None
+
+    def test_all_models_importable_from_init(self) -> None:
+        """All models should be importable from app.models."""
+        from app.models import (
+            User, Exercise, Warmup, WorkoutDay,
+            UserExerciseProgram, WorkoutSession, WorkoutLog, ProgressLog,
+        )
+        assert User is not None
+        assert Exercise is not None
+        assert Warmup is not None
+        assert WorkoutDay is not None
+        assert UserExerciseProgram is not None
+        assert WorkoutSession is not None
+        assert WorkoutLog is not None
+        assert ProgressLog is not None