Side plank with arm raise - over head

Lie on your side with your legs straight.
Stack your feet together on the floor.
Lift yourself up on your side using the lower arm with the hand on the floor.
Your hips will come up off the floor until your body is a straight line from your head to your feet.
Lift your upper arm up over your head.
Do not allow your body to sink or wobble too much.
Relax and repeat.