Kiwi cyclist Greg Henderson is responsible for this one.
He's posted the picture below of his Tour de France team-mate Andre Greipel having a "quad-off" with his German track cycling team-mate Robert Forstemann. For the record, Forstermann is on the right, and it will come as no surprise that his nickname is Mr Thigh!
So even if you can't beat these guys in muscle development, use your intellect to come up with a caption. The normal rules apply; keep 'em short, on-topic, pithy and above all funny, and don't get unnecessarily personal.