LIMEN HELIX Fitness Locate yourself →
The recursive arc

You are always somewhere in the arc.

One arc of eleven phases, Null Symmetry to Reintegrated Recursion, governs the body at every scale at once: a rep, a set, a session, a day, a season. The same shape, nested inside itself, turning higher each time. The only question is where you are in it right now.

This is the map. It's free. Knowing where you stand on it, and what to do there, is the work.

The map, free

The eleven phases

Eleven phases, Null Symmetry to Reintegrated Recursion, plus one fork where the path can split. Every phase is a real physiological state. Distress is never a phase. It's getting stuck in one, or failing a transition.

Free instruments

Read your own numbers.

The map is free, and so are the instruments to locate yourself on it. Real sports-science formulas, run right in your browser. Nothing is sent anywhere, nothing is stored.

Critical Power & W′

Monod–Scherrer model

Your sustainable aerobic ceiling and your finite anaerobic battery, from two all-out efforts.

Where do watts come from? Cyclists read them off a power meter; runners use a running-power watch (Stryd, Garmin, COROS) or a treadmill's watt display. Do two even, all-out efforts of different lengths — a ~3-minute and a ~12-minute work best.

Race Time Predictor

Riegel endurance law

Enter one recent race and see predicted times across every distance, using the empirical fatigue exponent 1.06.

How to enter it: use a recent, evenly-paced race or time trial. Pick km, miles, or metres for the distance — your predicted pace shows back in that same unit.

Natural Muscle Ceiling

FFMI · Kouri et al.

Your fat-free mass index and how close you sit to the drug-free upper limit (~25 normalized).

Body fat %: from a DEXA/InBody scan, calipers, or a careful visual estimate — even a rough figure works. FFMI is a metric index; your lean mass shows back in whichever weight unit you pick.

Metabolic Engine

Katch–McArdle

Calories from your lean mass (sharper than height/weight formulas), plus cut / maintain / build targets and protein.

Activity = how many genuinely hard training days you average per week. Body fat % from a scan, calipers, or estimate.

True Max HR & Zones

Tanaka + Karvonen

A better max-HR estimate than 220−age, and your five training zones (heart-rate-reserve if you add resting HR).

Injury-Risk Load

Acute:Chronic · Gabbett

Compare this week's training load to your rolling 4-week average. The 0.8–1.3 band is the injury sweet spot.

What is "load"? Simplest: for each session multiply your effort (RPE 1–10) by its minutes, then add up the week. Example: a 60-min session at RPE 7 = 420. This week = that total; 4-week avg = the average of your last four weekly totals. Lifters can use weekly tonnage, runners weekly distance — just stay consistent.

Estimates for healthy, screened adults — education, not medical advice. Each tool names the model it uses; the math runs on your device.

The honest part

What we know, and what we're still proving.

Reality is the flux. The map is the abstraction we lay over it to make it usable. Everything inside each phase on this page rests on published, cited physiology. The bigger claim, that one arc of eleven phases is the same shape at every scale and in every domain, is not proven. We do not sell it as proven. We show the work and let you watch the gap close.

Known · free · cited

The mechanisms

The physiology inside each phase is established science, and it is free on this page.

  • Cortisol and insulin-sensitivity rhythms
  • Autophagy, glymphatic clearance, supercompensation
  • Volume landmarks (MEV to MAV), RIR, zone-2, allostasis
Frontier · unproven · the reason to stay

The one arc

That these states form one repeating, ordered shape, nested from a single rep up to a whole season, and that the same shape governs a market, an ecosystem, a life. That is the hypothesis LIMEN is testing across twenty domains.

  • The arc is a model, not a proven law
  • Every piece of it gets tested in the open
  • Fitness is the doorway you can feel in your own body
EstablishedThe phases are real physiological states. Each one is standard exercise science. Open the evidence on any phase above: the peer-reviewed citations are free, linked to PubMed, with the honest caveats where the literature is mixed.
ConsilientPeriodization already orders training into blocks. The arc names that sequence and claims it recurs at every scale. Agreement across frames is a stronger reason to look, never a proof on its own.
FrontierOne identical arc across every scale and every domain. This is the open claim. It is being tested, it can fail, and where it fails we say so. Surviving honest attempts to break it is what earns a claim the word fact.
Consilience, not proof
When old practice and modern data point the same way, that is a reason to look harder, not a substitute for evidence.
Falsification earns the word fact
A claim becomes fact by surviving honest attempts to break it. We run those attempts in the open.
Nothing about the frontier hides
The map is free, the science is free, and where the arc holds or breaks is public. Only your own programming sits behind the wall.
The secret isn't the map

It's where you stand on it.

Read the arc as a periodization model: eleven phases, each a physiological state with its own optimal load, fuel, and recovery. The map is free. Each phase is a written monthly mesocycle built for the state you're actually in, yours to run on your own. Train the phase you're in. Build toward the ones you're not. When you want eyes on it, add live coaching on top.

Top tierThe Coaching Layerlive 1:1 · any phase
Add a live 1:1 to any written phase. A monthly Zoom call where your mesocycle is prescribed to you, your lifts and readiness reviewed, and the plan adjusted in real time. The human layer on top of the program.

Every phase is a written monthly mesocycle you can run solo. Add The Coaching Layer for live 1:1 on any phase. Enrollment opens soon. Add your email and I'll bring you in first.

Grounded in published science: Issurin on block periodization, Schoenfeld on hypertrophy mechanics, Seiler on polarized training, Volek on fat adaptation, Panda on circadian metabolism, McEwen on allostasis, Craig and Porges on interoception. The mechanisms are cited; the arc is the model.

LIMEN Helix · Fitness · the human doorway into the Medicine domain · limenhelix.com/fitness · one of the twenty domains.
Educational framework, not medical advice. Low-carbohydrate and ketogenic protocols aren't right for everyone and warrant supervision.