THERE ARE QUADS. THEN THERE ARE CYCLING QUADS. And of the four muscles that make up the quadriceps, the one that’s come to signify the strongest, hardest-working riders—and the one that routinely turns heads on your rides—is the teardropshaped bulge just above the knee called the vastus medialis oblique, VMO for short.
Though muscle size and shape partly come down to genetics, there’s hope for your “second knee.” The muscle tends to get stronger in riders who remain seated more often and push bigger gears, says Mike Schultz, CSCS, a Pittsburgh-based cycling coach. This is because the muscle primarily engages in the 12- to three o’clock position of the pedal stroke, where you apply most of your downward power. But, he says, “All four quadriceps muscles are key in cycling.…