Question: is 20 mph fast running?
Answer: Yes, 20.5 miles per hour is fast for humans in general. ... But with that said even for most athletes 20.5 mph is pretty damn good. Usain Bolt ran around 28 mph in his prime. Apparently there's a video of a Michael Scott, some regional manager at a Dunder Mifflin, that shows him reaching maximum velocity at over 30 mph.