You do almost everything in sports in a split stance, or by pushing off one leg from a parallel stance, so this is
a great exercise for athletes. It just makes sense to train your body that way when you play that way. Before you squat, lay a pad down to set your range of depth; this creates consistent depth, and also serves to cushion the knee. To add difficulty, you can hold two dumbbells, though it's tough to go really heavy with this TRX exercise.