Structural Balance Assessment Questions

If I am conducting an assessment on a client using a wobble board, What movements dictate an imbalance in the hamstrings vs. the quads? I have never used a wobble board as an assessment and I am curious to see if this will make a good addition to my assessment. I usually use the split squat to determine if the hamstrings are week but I have a Poliquin cd and he says he uses a wobble board. Any help would be appreciated.