I love squats! (Those of you who take my Run Fusion already know that, because we do a LOT of them.) There are so many different varieties and athletes can continue to challenge themselves by adding variation.
Why you should be doing BOSU ball squats
Walking squats, single leg squats, or squatting on an unstable surface can help add core, hip, glute and foot strength.
Work on a proper squat form in place, then try walking it. Finally, give the BOSU ball a try.