Four Corner Lunge - within this exercise there are a number of variations as well as mediums. Beyond the "standard" forward lunge is one of my personal favorites that is the "four corner lunge" whereby you before a standard forward, then backward lunge followed by a deep side lunge to the dominant side, repeating each leg by three repetitions. The key to this lift is the feet are always pointed directly ahead putting particular stress on developing great hip strength and flexibility. Another variation to this is to add lunges to 45 degrees out to the side.
Single Leg Box Squat: this is absolutely not a basic bodyweight squat or also what is termed a "pistol squat". To perform, place back of heel against box which is knee height. With one leg raised as in Rx position 2, push butt back to box, drive leg off ground back to starting position and repeat with opposite leg.