I am new to the forums and am hoping for your expert advice. After injuring my knee while running last September, I have been healing and rehabbing. Now I am in the midst of the November 2011 Low Impact Rotation and want to substitute Low Impact Sweat for the Slide and Glide, which has too much lateral stress on my knees. Do you think that's a good swap? And what can I swap for forward lunges? So far I have been doing either dips (backward lunges), curtsey lunges, or squats. Thanks for any and all advice!