I masturbate thrice daily, but usually only break a sweat when I'm not concentrating.
The only time I'd call it "competitive" is when we go double dutch rudder style, and see which of us can make the other come first. Nothing gay; it's just what straight guys do when they are bored.
Too cold for golf? Double dutch. Too windy for tennis? Double dutch. Don't feel like swimming? Double dutch. Here is a perfect example of a fierce double dutch competition:
