I believe I am on on an indoor soccer team for the next couple months... hopefully... and I should be playing tonight. The surface I'll be playing on is an artificial turf, and it feels terrific on my knees and ankles. It's the kind of turf with short grass and small black rubber pellets. It seems to have the perfect amount of give. I wore my firm grounds on it last week, and they seem to do alright. Though I did slide out as I was hitting one shot, but other than that, it was great. I would say turfs would do the best on it, but I haven't got a pair. I also don't know if it was this pitch in particular, but I was having the hardest time judging the pace of a bouncing ball. It slowed down a lot on this pitch. Maybe because there is an abundance of the rubber pellets, so when the ball bounces on these, there is more friction than when the ball bounces on the artificial grass material, slowing the ball down? Just a theory. I'll adjust. Now that I don't need to worry about my joints, I can focus on not pulling a muscle.