I'm guessing it's college? I'm not sure where you're from or the availability (depending on the size of the school), but I would look into exercise science/physiology. They do all different types of physical performance tests.
If you have any large research universities near you (or if you go to one) just check out their list of majors, look up one of the professors (preferably with a PhD) and pick a topic you like. Most of them are required to do research.
If none of that is available, try a hospital and see if they have any medical trials going on or if they're currently researching anything.
Just throwing some stuff out there, hope it helped.