I have completed one week of the workout and so far I like my results.  My arms look bigger and feel stronger.  I plan to rest for two days in just to give my arms some healing time.   I always feel something after each session and I am getting closer to being able to complete the 75 second workout without having to switch hands. I have gotten my time down to 50 seconds before switching.  i used to have to switch every 15 seconds on the last workout but that is no longer the case.