Unless you have a good superwide, it's hard to do and really really hard to compose a good image. I have tried a bunch. Good luck with it though, just remember that you need to focus on teh actually jumping just as much as the photo unless you are looking to fuck up yo cam.
On a similar note though, When I shoot park laps, sometimes I will just follow cam or 3 people throught the park, I don't really stop moving, hardly set up for a shot. its good to be spontaneous because random shots give good ideas for new angles and composures sometimes.