Just learn the game (or the gym movements and timings, in your case); I used to shoot many many years ago volleyball, and I was shooting with a canon 10D (yes, I said it was maaaaany years ago), I don't remember what was 10D's framerate (probably no more then 3/4fps I guess), but believe me I was shooting with 1fps drive, and I was nailing 80% of the shots, because I knew the game, so I knew when someone was going to receive, jump, hit the ball, run for it, etc, and being used to reactions times of the 10D, I knew what was going to happen in the next half second, and was pressing the shutter with the fraction of a second before, so when the picture was taken the action was developing as I had predicted.
That was I was saying with my posts, when you had no motor, or 2/3fps motors (saying "motor" I mean during film days, when I started), you just learned what was happening in front of you, you trained to understand and anticipate the game, and so you were getting the right moments at the right time; now it's a bovine 40fps race to take 300 pics and choose a couple. I'm old, surely, but I don't like it, that's all, it's the death of the photographer's ability and understanding of what's happening in front of you.