This is a good supplement to your workout. I run and lift weights , so I didnt' feel anything later, but totally different muscle work than what i am used to. It's slightly challenging, I found it was best after at least 10 minutes on treadmill.I wanted to trim down- after years of weightlifting i am larger than i'd liek to be so I wanted to maintain tone while losing some inches. This seems to be working- positive reviews from my husband!Going to try round assets or abs next.