The library
Arm accessory

Bodyweight Skullcrusher

Trains triceps first, with real work landing on core, front delts.

Muscle contribution per set

Triceps1
Core.20
Front Delts.15

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
0squeeze

Elbow extension against bodyweight at an angle; slow eccentric is the only way to progress once the angle is fixed.

Hands on a table edge, body straight; lower the forehead to the edge, press back out.

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.