Algorithm-driven · Beta
One coach for your lifting, your running, your recovery, and your nutrition.
A good coach would weigh all of it before telling you what to do tomorrow. Mass in Motion does the same, in one app on one subscription, and shows you the reasoning instead of asking you to trust it.
- Lifting and running are planned together, so the hard days stop landing on top of each other.
- Your paces and your working weights move as you do, off the sessions you actually logged.
- Had a rough week? The plan backs off before you dig a hole, and tells you why.
- Pick your goal and it adjusts your calories for you each week, off what you logged and how your weight is actually moving.
Free to join. Founder pricing is $64.99/year for the first 50 eligible members, against $89.99 normally.
One system
What each piece does, and what it feeds.
Lifting is the anchor. Running, recovery, and nutrition are built around it rather than bolted on, and each one is an input to the others: what you lift sets the load your recovery score reacts to, that score shapes the next session, and what you eat and weigh moves the targets underneath both.
- LiftingStrength, hypertrophy, conjugate-style, or powerbuilding programs that auto-progress, track your estimated maxes, and balance volume across muscle groups.
- RunningEasy, threshold, and interval paces set from your recent performance, with weekly mileage that climbs at a rate your body can handle.
- RecoveryA daily readiness score from training load, HRV, resting heart rate, and sleep that names what is holding you back and adjusts the plan.
- NutritionA fast food logger plus an adaptive calorie engine that retunes your targets each week from what you log and how your weight is trending.
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
Product tour
See how your training comes together
01
Your training day, decided
Today opens on the scheduled lift or run for that day, with estimated duration up front.
A recovery score and coach notes sit alongside the session so context is visible before starting.
02
Every workout, ready to run
Today's workout lists each exercise with prescribed sets, reps, and load.
Sessions are structured so lifting and running work are tracked in the same log.
03
Strength and running programs together
Programs shows your selected lifting style next to the running plan for the week.
Both disciplines are scheduled in the same system instead of two separate apps.
04
See the complete plan
Program Overview lays out the full multi-week schedule for lifting and running.
Every session ahead is visible, not just the current day.
05
Recovery trends in context
Recovery Trends charts the daily recovery score over time next to training load.
Inputs are drawn from documented recovery data, not a generic wellness score.
06
Strength progress without spreadsheets
Strength Records tracks estimated one-rep max history for tracked lifts automatically.
Progress is logged from completed working sets as they happen.
07
Running targets tied to performance
Race Predictor estimates race-pace targets from recent running performance.
Pace zones update as logged runs change the underlying performance index.
08
Every run in one history
Running History logs distance, pace, and duration for every completed run.
Runs and lifts are both visible from the same account history.
Programs
Lifting and running, programmed together
Traditional strength, hypertrophy, conjugate-style, and powerbuilding plans are scheduled alongside your running mileage in one system instead of two disconnected plans. The complete multi-week schedule is visible up front, so you can inspect what a training block looks like before you start it.
Programs does not promise a particular outcome; it shows the plan the algorithm generated and lets you see every session ahead of time.
Recovery-aware
Recovery guidance you can trace
Daily recovery scoring uses documented inputs such as HRV, resting heart rate, and recent training load to show a recovery window for the day, not a black-box number.
This is training-load guidance, not a medical assessment. See the full methodology for how the score is built.
Early access
Seen enough?
Join the list and we will email you the launch date and your founder pricing details. Founder pricing is $64.99/year for the first 50 eligible members, against $89.99 normally.
Adaptive nutrition
The calorie engine that closes the loop
Training is only half the outcome: body composition is won or lost in the kitchen. Whether the goal is dropping fat without losing strength, building muscle without piling on fat, or fueling higher mileage, the adaptive calorie engine keeps your intake matched to what your body is actually doing, so the work you put in training isn't undone by guesswork about food. Same deterministic, transparent approach as the training algorithm, and part of the same subscription, not a separate macro app.
01
Log food and weigh-ins
Scan a barcode, search a database built on USDA and Open Food Facts data, quick-add macros, or reuse saved recipes and custom foods. The day view tracks calories, protein, carbs, fat, fiber, and micronutrients.
02
The engine measures your real energy needs
Instead of trusting a static formula forever, it computes your observed daily energy expenditure from what actually happened: logged intake against your smoothed bodyweight trend.
03
Your targets update weekly
Calorie and macro targets step toward your goal rate (cut, maintain, or gain) in small, capped weekly moves. Rate-of-change limits, calorie floors, and deficit caps follow established energy-balance science, and missing data freezes the target instead of guessing.
Pricing
One subscription covers all of it
Log your own lifts and runs for free, forever. Premium is a single subscription that covers adaptive programming, recovery scoring, pace targets, and nutrition tracking: what would otherwise be several separate apps and several separate bills. Every paid option starts with a 14-day free trial on every plan. Founder pricing is a limited annual offer for the first 50 eligible early members.
Free
$0/forever
Log lifts and runs, track sets with RIR, save routines, and use the exercise library with no subscription.
Monthly
$12.99/month
$12.99 per month after the 14-day free trial.
Annual
$89.99/year
$89.99 per year after the 14-day free trial.
Founder
$64.99/year
$64.99 per year for the first 50 eligible founder members.
Why this exists
I tested an AI coaching app that scheduled a hard interval session the day after my heaviest leg day. I asked if anything looked off. It said no. I had to point at both days directly before it admitted the intervals would probably take a hit from the leg fatigue.
I knew enough to catch that. Most people wouldn't.
Brandon Lemley
Founder, Mass in Motion
That gap is why Mass in Motion generates programs from a deterministic algorithm instead of a language model improvising a workout. The scheduling rules are written down, they run the same way every time, and you can read exactly how they work before you ever pay for anything.
Science and guides
Built on exercise science, explained plainly
FAQ
Common questions
Do I still need separate apps for lifting, running, and macros?
No, that is the point. One subscription covers strength programming, running plans, recovery scoring, and nutrition tracking in one place. Beyond one bill instead of several, the pieces inform each other: training load feeds the recovery score, recovery shapes the next session, and your bodyweight trend tunes your calorie target.
What do I actually get if I join today?
Two emails and no obligation: a confirmation email now, and the launch date when it is set. Joining also puts you in line for founder pricing, which is $64.99 per year for the first 50 eligible members against $89.99 normally. If you want the app before launch instead of news about it, apply for the beta and you can be training on the build now.
What does it cost?
Logging your own lifts and runs is free forever, with no subscription. Premium is $12.99 per month or $89.99 per year, and every paid plan starts with a 14-day free trial. Founder pricing is a limited annual rate of $64.99 for the first 50 eligible early members. One subscription covers programming, recovery scoring, pace targets, and nutrition tracking.
What makes this different from every other lifting app?
Most apps store a program you picked and log what you did against it. This one writes the program and keeps revising it. Loads climb off an estimated max recalculated from your logged working sets and RIR, volume is tracked against per-muscle-group landmarks so nothing quietly gets undertrained, weak points get their own accessory work, and progressions, deloads, and tapers are scheduled before you stall. If you also run, the running is planned into the same week rather than left to fight your leg days for recovery.
Does AI write the programs or pick exercises?
No. Programs are generated by a deterministic algorithm designed and tuned by a human. No language model invents exercises, substitutes lifts, or assembles plans on the fly. The same inputs produce the same program every time, and the methodology is published rather than hidden.
When does Mass in Motion launch?
It is in beta now, and beta testers are training on the build today. The core algorithm, wearable integrations, GPS run tracking, and active workout logger are all live in it. Remaining work before public launch is device testing, app store review, and payment validation. Join the list and you will get the date as soon as it is confirmed.
Do I need a Garmin or Apple Watch?
No. Everything works with manual entry - log runs and lifts by hand if you prefer. Apple Health, WHOOP, and Strava integrations are live so HRV, resting HR, sleep quality, and run data can flow into the recovery engine.
Can I use my own program?
The 5-step custom program setup is live in the build now. Answer questions about your goals, weekly availability, experience level, injuries, and equipment, and the algorithm generates a full multi-week plan.
What happens if I get injured?
Flag the area in settings. The algorithm uses your flag to remove conflicting lifts, suggest lower-risk alternatives, and reduce running load until you clear the flag.
Does it track nutrition too?
Yes. The food logger supports barcode scanning, search across a database built on USDA and Open Food Facts data, quick-add macros, custom foods, and saved recipes. Calorie and macro targets adapt weekly from your logged intake and bodyweight trend, with conservative caps and floors: same deterministic, transparent approach as the training engine.
Does it work offline?
Yes, by design. Every tap writes to local storage first and syncs when connection returns.
Is there a companion watch app?
Not at launch. The app reads from your wearable rather than writing to it. The lock screen Live Activity widget for rest timers and GPS runs works natively on iOS without a watch app.
Early access
Carry the momentum
Join the list and we will email you the launch date and your founder pricing details. Founder pricing is $64.99/year for the first 50 eligible members, against $89.99 normally.
Want to train on it now? Beta testers get the build before launch. Four questions, about thirty seconds.
Apply for the beta →