Cross-Body Crunch
How to do the Cross-Body Crunch with correct form, the muscles it works, and where it fits a training plan you actually stick to.
Abs
—
Body Only
How to do the Cross-Body Crunch
- 1
Lie flat on your back and bend your knees about 60 degrees.
- 2
Keep your feet flat on the floor and place your hands loosely behind your head. This will be your starting position.
- 3
Now curl up and bring your right elbow and shoulder across your body while bring your left knee in toward your left shoulder at the same time. Reach with your elbow and try to touch your knee. Exhale as you perform this movement. Tip: Try to bring your shoulder up towards your knee rather than just your elbow and remember that the key is to contract the abs as you perform the movement; not just to move the elbow.
- 4
Now go back down to the starting position as you inhale and repeat with the left elbow and the right knee.
- 5
Continue alternating in this manner until all prescribed repetitions are done.
Log it, see it on your body.
Every Cross-Body Crunch set you log feeds Ascend's anatomy heatmap — so your abs volume is visible at a glance — and counts toward your bodyweight-strength tier.
More abs exercises
The climb is free. The Club is how you go further.
Core tracking is free forever. Club unlocks the coach, the competition, and the depth — for the price of one protein-shake a month.
Your own coach character
Pick Rae, June or Atlas — a coach that reads your last 90 days and proposes the next move. Free gets nudges; Club gets the full conversation.
Mountain leagues, worldwide
Get ranked against climbers everywhere — every muscle tiered by bodyweight strength. Promote, demote, and prove it weekly.
Weekly + monthly challenges
Fresh goals that keep the streak interesting — solo or with your crew. Something to chase beyond your own numbers.
Deep analytics + PR projections
See exactly when you'll hit your next PR and bodyweight goal — 4, 8, 12 weeks out. The trajectory, not just today's number.
Unlimited crews
Run as many crews as you want — squads, family, gym friends. Shared summits, cheers, and a feed that keeps everyone climbing.
Themes, higher AI limits, full export
Aurora, Volcanic and Summit themes. More AI chat headroom. And CSV + JSON export of everything, anytime — your data stays yours.
14-day free trial · no card · cancel anytime · founder pricing locked forever.