KHANFIT
1 · Start
2 · End position

Crunch

Crunch

CoreBodyweightBeginner
TrapsChestSide deltsFront deltsBicepsForearmsObliquesAbsHip abductorsQuadsAdductorsCalvesTrapsChestSide deltsFront deltsBicepsForearmsObliquesAbsHip abductorsQuadsAdductorsCalves
Front
LatsTrapsUpper backRear deltsTricepsForearmsLower backHip abductorsGlutesHamstringsAdductorsCalvesLatsTrapsUpper backRear deltsTricepsForearmsLower backHip abductorsGlutesHamstringsAdductorsCalves
Back
AbsObliques

Primary muscle

Abs (rectus abdominis)

Secondary

Obliques

How to do it

Lie on your back, knees bent, feet on the floor, hands lightly behind your head. Curl your upper back off the floor, squeeze the abs, lower slowly.

Common mistake

Pulling the head with the hands; jutting the neck forward; fast, swinging reps.

Alternative

Dead bug (easier on the back) · ab machine
Abdominal MachineDead BugPlank

Your results

No logs yet. Suggested start: bodyweight, increment 1 reps.

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Install on phone

  1. In Safari, tap the Share button at the bottom (a square with an up arrow).
  2. Choose “Add to Home Screen”.
  3. Khan Fit now opens as a separate app and works offline at the gym.