[alegsghed]

I do about 80-100 reps on some basically small 8-10kg weights per day, but after doing a couple of minutes on a powerball, my arm feels like ive done about 100 reps. Is it possible that just from a couple of minutes on a powerball that it could do the same for my arms as these weights? Just seems really weird. I've just purchased a powerball today so i will give a try and see what the results are over the long run.