← Library
Bodyweight progression

Plank

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

Muscle contribution per set

Core1
Glutes.15
Front Delts.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

Hold, don't count reps.

Isometric anti-extension hold — tempo notation not applicable.

Hold 20–60 s; body straight, ribs down, glutes and quads engaged, breathe steadily. Progress by adding movement or instability.

General isometric training literature — holds are prescribed by duration and bracing quality, not rep tempo.

How Forge progresses it

Progresses by reps, not weight — you earn harder sets, longer holds, or extra reps rather than plates.

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