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Bodyweight progression

Hollow Body Hold

Trains core first — focused, direct, nothing hidden in the movement.

Muscle contribution per set

Core1

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 20–45 s; ribs down, lower back pressed into floor, legs and arms extended or tucked as prescribed. Breathe steadily.

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.