Kick, Punch and Crunch and KickMax are generally low impact. The one of two moves that are not, are easily modified, and the workouts are quite good. I have bad knees and do both of these with no problem (with those minor modifications, of course). Low Impact Circuit is pretty good, although it depends on what your issue may be - I do this one only once every few weeks because my knees don't tolerate step very well, but it's generally pretty good, as well. I also find Drill Max to be just fine (and great fun!)