I did not do the shake weight for three days.  The rest was good and I found myself able to shake a little faster than before.  I struggled a little bit through the work outs but I was able to do the final workout on the men’s dvd without having to switch hands.  I forced myself through it.  My arms do feel very tired and it was a great work out trying to push myself.  It definitely raised my heart rate.  So far I am satisfied with Shake Weight and I am glad I purchased it.