The library
Arm accessory

Backpack Curl

Trains biceps first, with real work landing on forearms.

Muscle contribution per set

Biceps1
Forearms.35

These are the weights Heatwayve'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
1up
1squeeze

Elbow flexion with an improvised load; the long eccentric and top squeeze compensate for a load you cannot fine-tune.

Load the pack with books; keep elbows pinned, squeeze at the top.

Derived from tempo research on this movement class.

How Heatwayve progresses it

Progresses by load in +0.5kg steps — small muscles, small increments, long patience.

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