honestly, and while i may catch flak, i think bodyweight single leg squats(rear leg elevated) are a invaluable addition to anyones program.
That being said, i may be biased, considering i drive, a LOT, and for long durations for work, so my right leg is overworked, but the balance issue/strength imbalance was never more prevalent when i tried single leg work.
While i will never pull a Mike Boyle and espouse nothing but single leg work, it definitely does have its place.
I vote GHR's though
haha