Bicycle Crunch

1

Lie on your back on a mat, keeping your lower back lightly pressed to the floor.

2

Place your hands behind your head without pulling on your neck and keep your elbows wide.

3

Lift your legs to about 90° with your knees bent.

4

Bring your right elbow toward your left knee while extending your right leg.

5

Switch: left elbow toward right knee, extending your left leg.

6

Alternate sides continuously, as if pedaling in the air.