Teepees

Here's how to do a teepee:

Using a stability ball, roll your body out into a plank position with your feet resting on top of the ball like in the picture below.

Now, keeping your arms and legs straight, use your core strength to raise your glutes into the air forming a teepee shape as in the picture below.

Make sure to tuck your head as you move into the full teepee position. This is not only an excellent ab strengthener but also great for your shoulders. Shown above is the most advanced level. For an easy modification, you can start by placing your shins on top of the ball and curl your knees toward your chest as in the picure below.

From this position, you can add some additional stability work by walking your arms back toward the ball. Once you have your balance, slowly lift one arm at a time so that you are in a kneeling position on top of the ball as shown below. Add some upper body weight lifting and/or stretches to this position if you're feeling really stable. Hold for as long as you can!