Floor crunch

Floor or mat

Also called ab crunch, crunches

Lie on your back with knees bent and curl the shoulders off the floor toward the pelvis, then lower slowly.

Movement

Main movers get full credit for a set, helpers half.

Core

Scores 1-5 averaged over sources. Tap a rating for the claims behind it. Claims are our summaries of the linked sources, fact-checked by AI.

Muscle growth higher is better2.0
Below average; better options exist for every goal. 2 sources.
- 2/5 C tier: abs work with little hip flexor help but the floor prevents a deep stretch. Jeremy Ethier, It's Weird, But Destroyed Every Ab Exercise I Tested @ 1:33videoExpert opinion2026checked by AI
- 2/5 For trained people it is underloaded, since many can do 50 to 70 reps; it needs weighted or decline versions to stay challenging. Renaissance Periodization, How to Pick the BEST Exercises for Muscle Growth @ 6:11videoExpert opinion2025checked by AI