
Crunch with Legs on Bench
Abs


Core / Beginner / Compound (multi-joint)
A bodyweight exercise for the abs.
Why it hurts: The neck is strained and the ribcage does not rotate.
✓ Instead: Keep the hands light and rotate the shoulder toward the opposite hip.
Why it hurts: It turns into flapping and the lower back lifts.
✓ Instead: Slow down and keep the lower back on the floor.
How specific this exercise is to each movement.
Photos and instructions: free-exercise-db (github.com/yuhonas/free-exercise-db), public domain.