StayFit.

N3D Dev

In-app purchases

About this app

StayFit is the workout tracker that shows you exactly what you're training. Rotate a full 3D body, watch each muscle light up as you log your sessions, and finally see your training the way your body feels it.

Built for lifters who want structure without the spreadsheet.

WHAT YOU CAN DO

• 3D Muscle Map — Rotate an interactive body and tap any muscle to see its best exercises. Worked muscles are heat-shaded so you can see your coverage at a glance.

• Recovery tracking — Know what's fresh and what still needs rest, muscle by muscle, so you never hammer a sore muscle group again.

• Build your splits — Create your own routines or start from proven programs: Push/Pull/Legs, Upper/Lower, Arnold, PHUL, 5/3/1, Full Body and more.

• Log every session — Sets, reps, weight, and cardio, with a clean, fast logger and an optional workout timer.

• Track real progress — Training volume, personal records, bodyweight trends, and full history, all in clear charts.

• Health Connect — Bring in your steps, active calories, and weight, and log new weight entries right from the app.

• Stays on your device — No account required. Your data lives on your phone, not our servers.

STAYFIT PREMIUM

Unlock the full experience with a 7-day free trial:
• Full 3D Muscle Map
• Per-muscle recovery tracking
• Unlimited workout splits
• Complete history & analytics
• The full program library

Free always includes one split, workout logging, and your progress basics.

Whether you're chasing your first pull-up or your next PR, StayFit keeps every muscle, every session, and every gain in one place.

Download StayFit and train smarter.

What’s new

What's new in 1.2

• Muscle Map preview: explore the full interactive 3D Muscle Map before subscribing.
• Guided onboarding: new in-app tips help first-time users log their first workout with ease.
• Improved precision: more accurate muscle detection when tapping the 3D body.
• Performance and stability improvements throughout.