
Quadruped Abdominal Draw-In
Abs


Core / Intermediate / Compound (multi-joint)
A bodyweight exercise for the abs, with the rear delts assisting.
Why it hurts: The lower back is pulled into hyper-extension under body weight, a common strain.
✓ Instead: Roll only as far as you can keep a posterior pelvic tilt (slightly tucked tailbone). Roll toward a wall to limit the range.
How specific this exercise is to each movement.
Photos and instructions: free-exercise-db (github.com/yuhonas/free-exercise-db), public domain.