Exercise

Side Jackknife

Also known as: side v up, lateral v up, oblique v up

Side Jackknife is a compound exercise for the abdominals. Main target: obliques. No equipment needed — just your bodyweight.

EquipmentBodyweight

TypeCompound (multi-joint)

MovementPull

CategoryStrength

Muscles worked

Primary

Lie on your side with your legs straight, one on top of the other; place your top hand behind your head and your bottom arm on the floor for support.
Simultaneously raise your straight legs off the floor and crunch your torso up toward them, folding sideways at the waist.
Squeeze the obliques at the top, then lower back down with control.
Complete the set and repeat on the other side.