Inertia Fit

Inertia Software LLC

Contains adsIn-app purchases

About this app

Inertia Fit — Stay In Motion

A workout tracker built for experienced lifters. Maximum flexibility. Granular stats. Zero friction.

Train Your Way
• Start a quick workout and add exercises as you go—or build structured splits
• Save any workout to reuse later with one tap
• Smart suggestions know what's next in your rotation
• Supersets, circuits, and compound movements fully supported
• Swap or add exercises mid-session without breaking your flow

Stats That Actually Help
• Set-by-set comparison to your last session while you log
• Weekly, monthly, and yearly trends with period-over-period deltas
• Four PR types per exercise: weight, reps/time, volume, and estimated 1RM
• Muscle recovery tracking so you know what's ready to train
• Every workout card shows exactly what changed

Compete With Friends
• Leaderboards for volume, intensity, consistency, and more
• Try or save any workout your friends post—one tap
• Earn titles based on how you actually train
• All opt-in.

Fully Customizable
• Unlimited splits, workouts, and custom exercises
• Primary and secondary muscle targeting for accurate tracking
• Reps or time-based—your call
• Everything free. No paywalled features.

Why Inertia? An object in motion stays in motion. You've already built the habits. Inertia Fit helps you keep momentum—without getting in your way.

What’s new

Quick Workouts! Start a workout immediately, no setup required. Try Workout Feature for social activity feed! Friend Leaderboards for friendly competitions! Superset and Circuit support!