I love Sport Science, and this clip looking at the details of Dwight Freeney's spin move is really cool stuff.

They calculate that his spin is faster than a figure skater doing a double axel and that a free hit on the quarterback with a 7-yard lead-up produces 2,800 pounds of force -- the same as simultaneous punches by Mike Tyson AND George Foreman in their primes.

I watched it twice.