Start on your hands and toes.
While keeping your ribs flat push your head between your arms and bring your hips high.
If needed, you can keep your knees slightly bent and/or let you heels lift off the floor.
Gently press your hands against the floor to push yourself away from the floor.
Then lower your hips so that your body is in a straight line from heels to head.
Perform a push up keeping your elbows close to your sides.
Then bring one foot next to one hand and lift the same side arm up and reach towards the ceiling.
Return to the starting position and repeat with the other side.