RepShift programs your week — structured 24h and 48h fasts paired with progressive resistance training. The protocol used by people who refuse to lose strength while they cut.
The Protocol
1–2 structured 24h or 48h fasts per week, scheduled to hit the growth hormone window that peaks 13–24h into a fast. You train fed — fasts happen around sessions, not through them.
A periodized lifting program built for the fasted-and-cutting state. Leucine-optimized post-fast meals. mTOR cycling that keeps protein synthesis active even while calories are low.
Weight, strength, and body composition tracked weekly. The protocol adjusts. You see exactly what's working — no guessing, no plateaus you can't explain.
The Mechanics
Extended fasting (24–48h) triggers autophagy — cellular cleanup that accelerates fat oxidation — while growth hormone spikes 5x, aggressively protecting lean mass during the caloric deficit.
SOURCE: Cahill 1970; Ho et al. 1988
Chronic mTOR suppression from constant restriction blunts muscle protein synthesis. Periodic refeeding after fasts pulses mTOR, keeping anabolic signaling alive without stopping fat loss.
SOURCE: Laplante & Sabatini 2012
Breaking a fast with a leucine-rich meal (3–4g leucine) maximally activates muscle protein synthesis at a moment when anabolic sensitivity is elevated. You build back more than you broke down.
SOURCE: Norton & Layman 2006
Who It's For
The protocol engine is in private development. Get on the list — we'll email you the day it opens. Reply with your stats to be flagged for the first cohort.