Core & abs exercises

61 movements — how to perform them, what they train, and the mistakes to avoid.

Four different jobs, not one: resisting extension (planks, rollouts), resisting rotation (Pallof, bird dogs), resisting side-bend (side planks, carries), and actually flexing the spine (crunches, leg raises).

41 of these need no equipment at all — see the bodyweight library for the full list across every muscle.