Algorithm-driven · Beta
Four separate apps leave you connecting the dots. Mass in Motion brings your training together.
Free to join. Founder pricing is $64.99/year for the first 50 eligible members, against $89.99 normally.
See it all together
Lifting, running, recovery, and nutrition. One app. One subscription.
Mass in Motion
Mass in Motion is a hybrid athlete training and nutrition app that brings strength training, running, recovery, and nutrition tracking into one system.
Get early accessSeparate tools are illustrative examples with sample data. Final screen is from Mass in Motion.
The centerpiece
Lifting feeds recovery, recovery shapes training, and nutrition fuels both. An integrated loop instead of four apps that never talk.
Programs progress around your goals, equipment, and fatigue. Heavy lower-body sessions are spaced away from hard runs so leg work never sabotages aerobic progress.
Easy, threshold, interval, and marathon targets update dynamically from your recent logged runs. Weekly mileage scales safely alongside your lifting load.
Synthesizes training load (ACWR), HRV trends, resting heart rate, and sleep quality to indicate which fatigue mechanism is limiting your adaptation today.
The engine calculates observed daily burn by matching your logged intake against your smoothed bodyweight trend. Targets adjust weekly toward cut, maintenance, or surplus.
01 / Train as one athlete
Most apps force you to pick: follow a marathon plan that ignores your deadlift, or follow a powerlifting plan that treats running as an accident. Mass in Motion constructs the entire week together so your legs survive both.
6x800 + Upper
Intervals paired with an upper day on purpose: VO2 max work without adding lower-body lifting fatigue
Easy Run
Easy aerobic volume the day after intervals
Lower
Heavy lower day placed two days clear of the next quality run
Rest
No session scheduled
Full Body
Full-body session between the lower day and the weekend quality run
Tempo Run
The week's one quality run, on legs that have not squatted since Wednesday
Rest
No session scheduled
Hypertrophy, conjugate, traditional strength, and powerbuilding options.
Pace zones come from your Performance Index and update as your recent running changes.
Heavy squats and hard speed sessions are never scheduled on consecutive days.
02 / Know when to push
Most recovery scores are black boxes: an arbitrary percentage with no explanation. Mass in Motion shows the exact inputs — training load, HRV baseline, sleep, and resting heart rate — and tells you how to adjust today’s session.
Compares your acute 7-day fatigue against your 28-day chronic fitness capacity. Keeps training in the 0.8–1.3 progressive zone and flags sudden volume spikes.
Heart rate variability and resting heart rate are compared against your personal running baseline, preventing a single restless night from derailing your training block.
Translates physiological data into actionable decisions: hold planned intensity, trim accessory sets, or cap run pace at Zone 2 aerobic recovery.
03 / Personalized athlete research
SOREN is the research engine inside Mass in Motion. It analyzes your training, sleep, recovery, nutrition, and performance over time to discover relationships specific to your physiology.
Raw logs, wearable feeds & weigh-in trends
Isolates similar training contexts against each other
Surfaces emerging patterns under "Still learning"
Promotes only repeatable, sustained relationships
Across your last 30 lower-body sessions, acute sleep restriction reliably compromised top-set working weight, while bench press and easy runs showed no statistically significant reduction under the same sleep deficit.
04 / Fuel the work
Logging should take seconds, not minutes. Scan a barcode, snap a nutrition label, describe your plate in plain English, or search verified databases — every entry can be reviewed before it counts.
Barcode scan
Point your camera at any barcode to pull verified nutrition from a catalog built on USDA, Open Food Facts, and athlete-verified data.
Fast and reliable. If a product is not in the catalog yet, add it once and it is verified for the community.
Nutrition Facts scan
No barcode, or a product the catalog has never seen? Frame the Nutrition Facts panel and serving size, calories, and macros are captured directly.
The numbers come directly from the packaging in front of you, not a generic online lookup that might be a different formulation.
Describe meal
"Cheeseburger with onions, pickles, ketchup, wheat bun and kettle chips." Eating out means no barcode, so describe the plate in one line and let the parser split it into items.
Deterministic parsing, not an LLM hallucination. It matches your words against verified catalog servings without ever inventing numbers.
Search & recipes
Search foods directly, quick-add macros when you already know the totals, scan a barcode, or create a food. Saved recipes and custom foods sit right underneath.
A saved recipe or custom food logs in one tap the next time, so the meals you eat every week stop costing you anything to track.
The Payoff
See calories eaten, targets, and remaining at a glance. Protein, carbohydrates, fat, and fiber are tracked against adaptive targets set for your specific training demands — not a generic 2,000 calorie estimate.
The Adaptive Loop
Logged daily calories paired with your smoothed 7-day scale trend
Calculates observed daily burn from empirical data, eliminating static formula errors
Weekly steps capped at 150 kcal toward cut, maintenance, or surplus, with physiological calorie floors
Data sources
Recovery metrics and completed runs sync seamlessly into your schedule, informing what the algorithm prescribes next.
HRV · Sleep · RHR · Steps
Recovery · Sleep · Strain
Runs · Pace · Routes
Android health · Wear OS
Sleep · Readiness
Early access
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.
Transparent pricing
Log your own lifts and runs for free, forever. Premium replaces what would otherwise be four separate apps and four separate subscriptions with one coordinated system. Every paid option includes a 14-day free trial.
$0/forever
Log lifts and runs, track sets with RIR, save routines, and browse the full exercise library with no credit card.
$64.99/year
Unlimited custom programs, weekly schedule protection, recovery scoring, 4-way nutrition tracking, and SOREN personal research.
$12.99/month
Full premium access billed month-to-month. Cancel anytime with one tap.
Compare with four separate subscriptions: lifting app ($12/mo) + running plan ($15/mo) + recovery tracker ($30/mo) + macro tracker ($10/mo) = $67/mo. Mass in Motion starts at $5.41/mo.
See full pricing and feature breakdown →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
FAQ
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.
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.
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.
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.
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.
Both, doing different jobs. SOREN is a research engine, not a chatbot: it uses machine learning to run the statistical equivalent of an n-of-1 study on you, across your own logged sleep, outcomes, recovery, exercises, and nutrition. It waits for a pattern to repeat across enough sessions and enough weeks, tells you plainly what it is still learning, and only then shows a finding with the evidence behind it. It does not use generative AI to create your workouts. Your program is still written by the deterministic algorithm. ML learns, algorithms program.
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.
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.
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.
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.
Yes. The food logger supports barcode scanning, Nutrition Facts label scanning, plain-text meal descriptions, search across a database built on USDA, Open Food Facts, and FatSecret Premier data, plus verified entries submitted by other athletes, 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.
Yes, by design. Every tap writes to local storage first and syncs when connection returns.
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
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 →
