the short-term nature of resistance training studies leaves open the possibility that results may be at least in part attributed to a novelty effect and that findings might diverge over time.

research shows the rectus femoris seems to grow more from single-joint, machine-based knee extension training relative to the other three quadriceps. (2)

a 2015 systematic review found that hip adductor strength was one of the most common risk factors for groin injury in sport. (2)