News flash: basement-bound nerds think being a world champion-caliber athlete is easy. Film at 11.
Let go of your hatred of the dumb-ass jocks who got laid in high school but could never compete on a professional level, and consider that it might not be so brainless to be a world-class athlete. All this study says is that the very best athletes have learned to do it on autopilot, but for everyone else a lot of thinking is involved.
Geeks can actually simulate the experience to a certain degree, given that some modern video games have evolved to a high degree of realism. Play "Madden NFL" on an expert difficulty level, and you'll see just how hard it can be for a NFL quarterback to try to read the movements of 11 defensive players simultaneously and pick the best route to throw the ball... even when you don't actually have to have the arm strength to throw it. Play "MLB the Show" on an expert level and you'll see how hard it can be to react in a tiny fraction of a second whether you're swinging at a 100 mph straight-ahead fastball, an 85 mph changeup that looks just like a fastball, a 90 mph slider that stars out straight but breaks away from the pitcher's arm, or a 70 mph knuckleball that just floats all over the fucking place.
TL;DR - (some) video games these days are good enough to replicate just how hard professional level athletics are, even without the actual physical exertion. Please don't dismiss athletics as brainless if you don't know what the fuck you're talking about.