Hi, just wondering if anyone can help. I always use the same trainers, but each time I get a new pair the first couple of times I run in them, I get a pain in the ball of my foot, sometimes right, sometimes left.. If the pain gets bad, I take off the trainer mid run, and rub my foot, then it's OK for another couple of miles and starts again... After a couple of runs the pain just goes... very odd.. answers on a postcard please.. ha ha..