I purchased this product because I am a 44 year old lady that can not lift any heavy weights because I have 3 cervical herniations and 3 more in my thorasic area. My activities are normal except when it comes to working out. I walk on the treadmill about 45 minutes every other day and I do the Resistance Chair almost every day. It's a wonder machine to keep my muscles in movement/shape but not so much that I'm in so much pain that I have to take my pain killers. It's great, I highly recommend it for those who have injuries and want to keep movement in their lives. Remember, the more we sit around the weaker our muscles become. The Resistance Chair is exactly what everyone needs to get a decent work-out without over doing it.