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Isolation

Machine Hamstring Curl

Trains hamstrings first, with real work landing on calves.

Muscle contribution per set

Hamstrings1
Calves.10

These are the weights Forge's volume audit actually computes with — deliberately conservative, so compounds don't masquerade as full coverage. A 0.5 means a set counts as half a set for that muscle: meaningful help, not a replacement for direct work.

Tempo

3down
0pause
2up
0squeeze

Seated or lying hamstring curl with slow eccentric; tempo maximises stretch and peak contraction.

Full extension at bottom; squeeze at top, avoid using momentum.

Derived from tempo research on this movement class — Wilk M, Zając A, Tufano JJ.

How Forge progresses it

Progresses by load in +0.5kg steps. Isolation work is where the honest-volume ledger pays off — compounds alone don't cover it.

Swap it for

Same movement pattern, same progression continuity — these are the alternatives the app offers mid-session when a rack is taken or equipment isn't there.

Train with intention. Open Forge — it prescribes the weight, watches the reps, and does this arithmetic for every set you log.