Instruct: Classify Amazon reviews into positive or negative sentiment
Query: High impact

Be aware that this is a high impact workout, with lots of springy, skippy kind of moves. I think if you follow it exactly you end up spending more time mid air than on the floor. My body can't take it (I've had stress fractures before from high impact kick boxing), and I really felt this in my knees, ankles, and lower back, so I'm modifying, but there are no directions on the DVD for modification so I'm just being creative. I don't know if I'll get the same results since there isn't specific explanation that I could understand as to why this cardio method is unique that I could then apply to the modification. Overall, it's fun and bouncy without much cuing.