So no skiing. From a standing start over an official distance, no demonstration events. This is what I have so far.
Running
100 meters in 9.58 seconds - speed 10.43 m/s, 23.35 mph.
Skating
1000 meters in 1:05.37 - speed 15.3 m/s, 34.2 mph
Bicycling
250 meters in 15.949 - speed 15.67 m/s, 35.05 mph
I’m surprised that the skaters are so close to the cyclists. Longer distances would favor the bicycle but none of them seem to be standing start.
Chronos
2
To be clear, you want the human to be moving, right? Because there are plenty of sports where a human propels some object much faster than that.
Human Powered Flight
27.5 mph