So it’s a great exercise. So the first thing you want to do is get your hands on the med ball. Just like so. I would lift yourself up in the plank position make sure you feel stable, because your going to start moving your legs. If this is hard enough here and this is challenging then stay here and hold this. So, the mountain climber you’re just going to bring one knee in and alternate with the other. Right and left, right and left all the while you are staying engaged in your abs and your pelvis is tucked under.