Hamstring Hammer
-------+---------------+----------------+count |1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & |-------+---------------+----------------+Right |t h h h h h h h h h h h h h h h |Left |t h h h h h h h h h h h h h h h |Repeat many times, faster and faster.