In the early 90's I once photographed white water kayaking with a 6x6 TLR. The Mamiya C330 with 80 and 250mm lenses. I shot one roll of film for the heck of it after primarily using my 35mm system. Both were manual focus. I got a couple of good photos but I never tried using medium format for sports again. The advantage of river kayaking is how close one can get to the subject. So, while sports with a medium format camera is an interesting challenge, and can be done, it is far easier with a FF or even smaller format.
What I remember most is how I must have really stuck out dangling on the rocks with my waist level TLR, prompting an older gentleman to suggest I join my local city camera club! I do regret never having done that.