Overview
The whole app, at a glance
Mass in Motion is a training and nutrition app for people who lift and run. It plans both, watches your recovery, and tracks the nutrition that fuels it: one app and one subscription instead of three or four. Here's the short version: the how it works page has the detail.
Integrations
Your wearable already knows. Now your training plan does too.
Recovery and run data flow in automatically from the sources below — or log everything by hand if you'd rather not connect anything.
- Apple HealthHRV · Sleep · RHR · StepsSyncing live
- WHOOPStrain · HRV · SleepSyncing live
- StravaRuns · Pace · RoutesSyncing live
- Health ConnectAndroid wearablesSyncing live
- OuraSleep · ReadinessPost-launch
Programming
Built around your goal
Pick what you’re training for and the app writes a week of lifting and running to match. Change your days, your equipment, or your mileage and the plan moves with them.
Strength
Progress you can actually see
Loads climb off an estimated one-rep max, volume is tracked by muscle group, and weak points get their own accessory work. Choose from traditional strength, hypertrophy, conjugate-style, or powerbuilding: each with structured progressions that rotate intensity and volume so you keep moving forward.
Running
Paces set by your own fitness
Easy, threshold, interval, and long-run targets come from your recent running and update as you get faster. Weekly mileage climbs at a rate you can handle.
Recovery
A readiness score with reasons
A daily score built from your training load, HRV, resting heart rate, and sleep. It tells you which kind of fatigue is the one holding you back today.
Nutrition
An adaptive calorie engine, not just a food diary
Log food by barcode scan, database search, or quick add, with recipes and custom foods for the rest. Then the engine computes your observed energy expenditure from logged intake and your bodyweight trend, and steps your calorie and macro targets toward your goal each week (cut, maintain, or gain) with rate limits and floors so the number never swings wildly.
Logging
Fast, and it works offline
Track sets by reps in reserve, run them from your lock screen, and keep your rest timers going when the gym signal drops. Nothing gets lost.
Adapts
It keeps the hard days apart
Heavy lifts and hard runs don’t get stacked back to back, and a tweak you flag gets worked around instead of ignored.
Wearables
Works with what you wear
Apple Health, WHOOP, and Strava feed recovery and run data in. No wearable? It still runs on your logged training.
No AI coaching
Rules, not a chatbot
Every session comes from defined training logic and your own history, not a language model guessing. Same situation, same sensible plan, every time.
Join the update list
Carry the momentum
Join the Mass in Motion update list for launch news, Founder pricing updates, and product announcements. Want to test the app? The beta is a separate application.
Want to beta test the app? The update list is for news. Beta access is a separate application.
Apply for the beta →