Sit-UpMuscles Worked

Sit-ups work your abs, mainly the rectus abdominis, as you curl your torso up off the floor. Unlike a crunch, you rise all the way toward your thighs, so your hip flexors help finish each rep.

Front and back body map of the muscles the Sit-Up works: abs primary
PrimaryAbs
Equipment
Bodyweight
Level
Beginner
Type
Isolation
Force
Pull

How to do it

  1. Lie on your back with your knees bent and your feet flat, tucked under a pad or held by a partner.
  2. Cross your arms over your chest, or rest your fingertips lightly beside your head without pulling on it.
  3. Breathe out and curl up one vertebra at a time, starting with your head and shoulders, until your chest comes close to your thighs.
  4. Pause briefly at the top with your abs tight.
  5. Lower yourself back down slowly, rolling down through your spine until your shoulders touch the floor.

Form tips

  • Lead with your chest, not your head, and keep about a fist's distance between your chin and chest.
  • Control the way down instead of dropping back, since the lowering half trains your abs too.
  • If you can only get up by swinging your arms, shorten the range or work on crunches until your abs get stronger.

Why it made the list

No. 1 of 13

Best Ab Exercises

The most recognized ab exercise in the world. Simple, no equipment.

More ab exercises

See it on your own body map

Log your Sit-Up sets in KasMaker and watch your abs fill in on the map, weighted by how much you did. Logging and the body map are free on iPhone.

Download on the App Store
KasMaker body map showing a week of training volume by muscle