MEN.com brings Mu and River North front and center in Varsity Heat Part 4, where a college gymnastics routine turns into a daring display of chemistry and control. What starts as a focused team pyramid quickly shifts when River pushes boundaries mid-formation, and Mu eagerly responds as the action escalates behind their teammates backs. As the routine grows unstable, their hidden hookup becomes impossible to ignore, sending the entire formation crashing to the mat. From there, Mu and River fully give in, showing off their athletic bodies and intensity as they take things all the way to a wild finish on the gym floor.