HOW IT WORKS
One loop. Every set becomes the next decision.
myoxin plans your training, watches what you log, and tells you what changes next and why. This page is the mechanism itself: the loop it runs, the score behind Light, Good, and High, and the parts it won't pretend to know.
THE LOOP
Plan. Log. Understand. Adapt. Then it happens again.
Each step feeds the next one directly: what you log changes what myoxin understands, and what it understands changes what it plans. Here's what actually happens at each step.
01 · PROGRAM
Start from what you already do.
Share your goal, schedule, and equipment, or hand over a program you already run, down to a single session you don't want touched. myoxin schedules every day that follows.
WHO'S IN CHARGE
You. Together. Or myoxin.
Pick how much control you keep. Whatever you leave to myoxin, it plans; whatever you keep, it works around.
02 · LOG
Log fast, and never lose a set.
Weight, reps, and RIR, including supersets and drop sets, in the time it takes to rerack. Every entry saves to your phone the instant you type it, then syncs in the background, so a dead connection mid-workout never costs you a set.
03 · UNDERSTAND
Read every session for what it actually did.
myoxin checks how your top lifts are trending, how hard the session really was, and which muscles did the work, the way a coach reading your log would. The full scoring model is below.
04 · ADAPT
Change only when the evidence says to.
A block holds steady until your training gives it a reason to move. Then load, volume, or exercise selection shifts, and the next session tells you exactly why in a line or two.
LAST WEEK, FOR EXAMPLE
You hit the top of your rep range on bench with reps to spare, twice in a row.
Load goes up next session. Weekly pressing volume stays exactly where it was.
THE STIMULUS MODEL
The score behind Light, Good, and High.
A rep count and a weight on the bar don't say much on their own. myoxin scores each set closer to how muscle actually responds: not just how much you moved, but how close to failure you took it and how much of the muscle had to switch on to do it.
01 · TITIN, THE SPRING
The spring that starts the signal.
Titin is a coiled protein spring braced inside every sarcomere. A hard rep stretches it under load, and that stretch is one of the first signals telling a muscle it's time to grow. The signal doesn't switch off when you rerack: it keeps registering for hours afterward.
02 · THE CELL RESPONDS
Tension becomes instructions.
That stretch flips on signalling inside the cell that ramps up muscle protein synthesis, the process of building new muscle. It's the step between a rep you just finished and tissue that's actually bigger next month.
03 · THE FIBRE
Repeated tension, thicker fibre.
Zoom out from one cell and you're looking at a muscle fibre running alongside thousands of others in parallel. Fibres that are repeatedly asked to produce high tension respond by getting thicker. That thickening, repeated across a fibre, is what muscle growth actually is.
04 · THE MUSCLE AND ITS NERVE
Why the last reps matter most.
A motor neuron recruits its fibres smallest first, and only reaches its biggest, most growth-responsive units once the effort gets genuinely hard. That's why reps in reserve matters as much as reps completed: the last hard reps of a set are often the only ones asking the fibres that grow the most to actually turn on.
Every set
becomes
a score.
myoxin's stimulus model weighs each set against this chain, per muscle, from 0 to 100.
The work you did.
How close to failure.
Primary mover or helper.
Time before it showed up again.
References
Henneman, E., Somjen, G., & Carpenter, D.O. (1965). Functional significance of cell size in spinal motoneurons. J Neurophysiol, 28(3), 560-580. doi.org/10.1152/jn.1965.28.3.560
Ibata, N., & Terentjev, E.M. (2021). Why exercise builds muscles: titin mechanosensing controls skeletal muscle growth under load. Biophys J, 120(17), 3649-3663. doi.org/10.1016/j.bpj.2021.07.023
Wackerhage, H., Schoenfeld, B.J., Hamilton, D.L., Lehti, M., & Hulmi, J.J. (2019). Stimuli and sensors that initiate skeletal muscle hypertrophy following resistance exercise. J Appl Physiol, 126(1), 30-43. doi.org/10.1152/japplphysiol.00685.2018
Zourdos, M.C., et al. (2016). Novel resistance training-specific rating of perceived exertion scale measuring repetitions in reserve. J Strength Cond Res, 30(1), 267-275. doi.org/10.1519/JSC.0000000000001049
Refalo, M.C., Helms, E.R., Trexler, E.T., Hamilton, D.L., & Fyfe, J.J. (2023). Influence of resistance training proximity-to-failure on skeletal muscle hypertrophy: a systematic review with meta-analysis. Sports Med, 53(3), 649-665. doi.org/10.1007/s40279-022-01784-y
Schoenfeld, B.J., Ogborn, D., & Krieger, J.W. (2016). Effects of resistance training frequency on measures of muscle hypertrophy: a systematic review and meta-analysis. Sports Med, 46(11), 1689-1697. doi.org/10.1007/s40279-016-0543-8
Schoenfeld, B.J., Ogborn, D., & Krieger, J.W. (2017). Dose-response relationship between weekly resistance training volume and increases in muscle mass: a systematic review and meta-analysis. J Sports Sci, 35(11), 1073-1082. doi.org/10.1080/02640414.2016.1210197
PERSONAL EVIDENCE
A pattern earns your trust. It isn't assumed.
Training is noisy: sleep, stress, and how you happened to order your exercises move the numbers as much as fitness does. Two good weeks don't prove anything on their own.
myoxin keeps a first observation separate from a finding that has survived more training. Its confidence, and any session that contradicts it, stay visible right beside the pattern, not hidden underneath it.
Predictions get written down before the result comes in, and a miss stays on the record. myoxin would rather flag something as an early read than oversell it as a proven pattern, so today the strongest claims are still rare.
RECOVERY & RESEARCH
Context for the week, not a verdict on tonight.
Recovery moves next week's plan, not tonight's set.
With permission, sleep and HRV trends from Apple Health or Health Connect get read once, ahead of Sunday's review: a rough stretch nudges next week's volume down a notch, a strong one does the opposite. A single bad night never touches tomorrow's session.
The literature search checks its fit, not just its title.
When a question needs outside evidence, the scientist searches the published research and reads for whether it actually applies: a comparable rep range, a comparable proximity to failure, a comparable lifter. It sets a starting point; your own repeated training decides if that starting point holds for you.
ONE SCIENTIST
One coach, everywhere you check in.
Build the plan, log the set, read the reason, all inside the app. Link WhatsApp too, for the moments texting beats opening it.
Download myoxinDo I need an AI-built program?
No. Bring your own, hand over as much control as you want, or let myoxin build one from scratch. Every session stays editable either way.
Will it change my plan every workout?
No. Holding a block steady is usually the right call. myoxin only moves something when your training gives it a reason to.
Do I need a wearable?
No. Your logged training is the foundation. A wearable just adds recovery context to the week ahead.
How is this free?
You connect your own AI key (Google Gemini, xAI Grok, or Z.AI). The provider sets any limits on it; myoxin doesn't mark it up.
