Lie on your front resting on your elbow.

Lift your body straight up resting only on your forearms and the tip of your toes.

Do not round your shoulders or curve your lower back.

Once stabilized, lift one leg straight up.

Do not drop hips.

Will help:

General fitness

Advanced Upper and Lower limb rehab

Hip flexor injuries

Shoulder stability

Groin injury

Osteitis Pubis