Band Bicycle Crunch

The bicycle crunch against a band anchored low in front of the feet, so each knee draws in against the band's pull.

How to do it

Setup

On your back, feet toward a rack, a band from its base looped around both feet, hands behind the head.

Steps

Pull one knee in against the band as the opposite elbow turns to meet it.
Push that leg back out long as the other knee comes in.
Keep the shoulders off the floor through every switch.

Common mistakes

Lying too close to the anchor: shuffle back until the band pulls with the legs long. Turning only the elbow: the shoulder lifts and rotates toward the knee. Letting the band snap the leg out: extend it under control.

Breathing

Exhale on each twist, inhale returning.