What rep range should you start with for the Swiss-ball reverse crunch?

Start with 2 to 3 sets of 10 to 12 reps, keeping the range small and pausing briefly at the top of each pelvic curl. Grow the range gradually as control improves rather than rushing to bigger lifts of the hips.

What can I use instead of a stability ball for the reverse crunch?

A regular reverse crunch with the knees bent toward the chest, no ball at all, trains the same lower-ab curl. If you want something to squeeze for cueing, a pillow or a folded towel between the knees works almost as well as the ball.

What does the Swiss-ball reverse crunch train, and when should I skip it?

It isolates the lower rectus abdominis through a controlled pelvic curl, which suits lifters chasing lower-ab hypertrophy or anyone whose reverse crunches turn into leg swinging without something to anchor against. Skip it if you feel it in your lower back rather than your abs, since that usually means the hips are swinging instead of the pelvis curling.

Intermediate

Swiss-Ball Reverse Crunch

Squeezing a ball between the calves and hamstrings gives you something to pull against as you curl the pelvis toward the ribs, biasing the lower rectus abdominals. The ball also cues the legs to stay together and the movement to come from the abs rather than swinging thighs. Keep it slow and let the pelvis, not the feet, lead.

Equipment: Stability Ball
Body part: Abs
Type: Strength
Browse by muscle: Lower Rectus Abdominals
Browse by movement: Spinal Flexion

How to do it

1
Lie on your back and pin a stability ball between your calves and hamstrings.
2
Place your arms flat at your sides for a stable anchor.
3
Brace the abs and curl the pelvis up toward the ribcage.
4
Lift the hips off the floor as the ball travels toward your chest.
5
Pause at the top, then lower the pelvis back down under control.
6
Keep the movement smooth without swinging the legs for momentum.

Tips

Drive the motion by rounding the lower back up, not by kicking the legs.
Keep the range small at first; a little pelvic curl goes a long way.
Press the arms into the floor to keep the upper body quiet.
Exhale as you curl the hips to help the lower abs engage.

Variations

Common mistakes

The ball squeezes loosely between the calves and hamstrings, so it slides around instead of giving the legs something solid to pull against.
The shoulders lift off the floor along with the hips, turning it into a full sit-up instead of an isolated pelvic curl.
The knees straighten out as the hips lift, turning the rep into a leg raise instead of a reverse crunch driven by the pelvis.
Rushing back down without pausing at the top skips the moment the lower abs are working hardest.
The arms push off the floor to help launch the hips up, borrowing strength from the shoulders instead of the abs.

Frequently asked

What rep range should you start with for the Swiss-ball reverse crunch?: Start with 2 to 3 sets of 10 to 12 reps, keeping the range small and pausing briefly at the top of each pelvic curl. Grow the range gradually as control improves rather than rushing to bigger lifts of the hips.
What can I use instead of a stability ball for the reverse crunch?: A regular reverse crunch with the knees bent toward the chest, no ball at all, trains the same lower-ab curl. If you want something to squeeze for cueing, a pillow or a folded towel between the knees works almost as well as the ball.
What does the Swiss-ball reverse crunch train, and when should I skip it?: It isolates the lower rectus abdominis through a controlled pelvic curl, which suits lifters chasing lower-ab hypertrophy or anyone whose reverse crunches turn into leg swinging without something to anchor against. Skip it if you feel it in your lower back rather than your abs, since that usually means the hips are swinging instead of the pelvis curling.

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