Quad dominance doesn’t just hurt your aesthetics; it will have you limping to the sides too. A recent study published in Isokinetics and Exercise Science followed 82 college basketball and soccer players through one season. The athletes hamstrings and quadriceps strength was measured at the beginning of the season and all subsequent injuries were reported. At the end of the season, researchers found that non-contact leg injuries were significantly higher when the hamstring-to-quadriceps strength ratio becomes severely imbalanced, with the hamstrings being weaker than the quads. To balance out your leg training, add glute-ham raises, swiss ball leg curls and stiff-legged deadlifts to your regime, and, as always, squat deep.