I haven't used handweights per se, but I have held on to the weighted metal circle things that hold the plates on the end of my barbell. (They probably have a name!) They about half a pound I imagine, maybe a little less. If I go heavier, I don't feel like I get a good recoil motion coming back on my punches or a nice sharp stop to my hooks or uppercuts. I especially feel the additional weight in my back muscles. I really concentrate on the recoil of a jab and contract the back when I come back. Not entirely sure if I should do this with a jab, but I do and it works for me. I don't feel this slight additional weight so much in the shoulders or abs, but I like to believe it helps with endurance. On the topic, I put these weights down when I do leg movements like squats or jumps into sidekicks just to give my hands a little break.--Jeanne