I never would’ve thought just bouncing would give me muscle strength, but the proof is in the pudding, so to speak. Just less than three months ago, I could only do 2 (from the knee) pushups without collapsing Now, just from using my Cellerciser at least 10-20 min./day, for the last two months, I did 40 (from the knee) pushups last night before giving out. Quite an improvement. I’d say! I haven’t had the nerve to try full body pushups yet but will try soon. I’m sure I won’t be able to do nearly as much as the from-the-knee pushups, but still going from 2 to 40 in less than three months is a major improvement! I always try to do that quad exercise on the Cellerciser (where you quickly go from one leg to the other, with knees bent) and I can definitely see some quad definition at this time also. Previously, I had trouble sticking with exercise for years as I thought I “had” to work out for 45 min-an hour each time and that always seemed a hard goal to reach. But, knowing that I only need to do 10 min day makes it so much more doable. No matter how tired I am at the end of the day. I can always manage to do 10 min. of bouncing and oftentimes do 15-20 min just because it feels so good and I don’t want to quit!