If you are at f/2.8 and ISO 3200 right now on that camera and can only get to 1/200th due to the lighting, then I would go for the shots of the gymnast when at a peak of their movement. There may still be a hand or foot with some blur, but it should give a higher keeper rate.
It is also good to keep working on catching the leaps and other moves, at some point you will have a location with better lighting or better equipment and you want to be past the practice stage when that happens.
If you can get to 1/500th by going to the very top ISO and then if the only problem with the shot is noise then your doing pretty good.