Recomposition

Recomposition — recomp — is the simultaneous loss of fat mass and gain of lean mass at roughly constant body weight. In energy-balance terms, a recomp sits near maintenance; the fat-loss and muscle-gain processes use stored body fat as the fuel source for the muscle accretion.

Who can realistically recomp

The populations with the most evidence of successful recomposition, in approximate order of ease:

1. Detrained individuals returning to training. Muscle memory is real; lost training adaptations return quickly.
2. Overweight or obese beginners. Large fat stores, untrained muscle — both directions of change can happen simultaneously.
3. Young, untrained individuals with higher body fat.
4. Older adults starting resistance training. Sarcopenia reversal can coexist with modest fat loss.
5. Intermediate trainees on a well-structured program. Slower and less dramatic than the categories above.

Lean, trained individuals (for example, a 12% bodyfat intermediate lifter near their genetic potential) can almost never recomp meaningfully. For them, net muscle gain requires a surplus and net fat loss requires a deficit; running both simultaneously at maintenance just spins in place.

The nutrition structure

• Energy intake: at or very near maintenance. Some coaches periodise around training — slight surplus on training days (+100–200 kcal), slight deficit on rest days — but the multi-week average is maintenance.
• Protein: high. 1.8–2.2 g/kg, sometimes pushed to 2.4 g/kg for aggressive recomps.
• Carbohydrates: adequate around training — 3–5 g/kg on training days is a common prescription.
• Fat: whatever remains; usually 20–30% of calories.

The training structure

Progressive resistance training is non-negotiable. Without a muscle-building stimulus, the "recomp" is just maintenance. Most evidence-based programs use compound movements with progressive overload, 3–5 training days per week, and enough weekly volume to drive hypertrophy. Cardio is peripheral to the recomp question; it can support the fat-loss side but does not substitute for resistance training on the muscle-gain side.

How to measure success

Scale weight is a poor signal during recomposition. Use:

• Body-fat percentage via DEXA (every 8–12 weeks), BIA (noisy — use same device, time of day, hydration state), or skinfold calipers (operator-dependent).
• Tape measurements at waist, hips, chest, arms — cheap, reliable, directionally useful.
• Photos in consistent lighting and poses.
• Training progress — rep-weight progressions are the single best proxy for net-positive muscle change.

Expectations

A successful recomp in a good candidate population produces visible change over 3–6 months, rarely faster. Scale weight may be within ±1 kg of starting weight for the duration. This is the exact outcome most consumer tracking apps fail to communicate well — they are weight-change-centric by design, and a flat scale during active recomp looks to them like "no progress."