Just been mucking around with a powerball, and was languishing around the 8/9K mark for ages (i.e. the last 2 hours) but just busted out a 10363 which I'm quite happy with! I'm pretty sure I can hit 11K today.
First post here. I injured my thumb using a powerball last year, not long after starting climbing. I stopped using it and it healed after a few months. I'm not sure if it was caused by squeezing hard or the fact that the edge of the ball was digging into the tendon or both. I may start working on it again carefully. I got up to around 11300.
90 second strengthGCW 15,281 (one hand, Eduoard)