The first features TAKASKE, a Dance Dance Revolution player with ballerina-quick feet. Here he plays all eight footpads at ludicrous speed.
Then there's Cara Black, a higly-ranked women's doubles tennis player with a killer net game. Here she's practicing volleys off the wall at close range.
She reels off 115 volleys in 43 seconds, beating the performance of her 16-year-old self.