Insanity is hard on my knees, what should I try instead?
I've completed about a week of Insanity so far and I can really feel it in my knees. They're starting to hurt, especially when I bend them. I've done P90X and TurboFire in the past so I'm good with intensity and fast pace exercises. Although I am continuing to workout with Insanity for now, I was thinking maybe I should…
