"The NRG BALL workout is very challenging. During our 4 minute workout I felt every muscle trembling: Abs, arms, chest, back and my heart rate was pounding as if I was doing a full court sprint.
This was an amazing workout! In only 4 minutes it felt like the equivalent to a 60 minute session. To be honest, I thought you were joking with me when you first said that a 4 minute NRG BALL workout is all you need to get fit. However, now I truly know you were serious as the sweat was pouring off my body and now I am looking forward to the next workout!
