ANATOMY
'(<a href="http://www.j-archive.com/media/2009-02-03_J_18.wmv">Sarah of the Clue Crew shows an anatomical diagram on the monitor, then puts her heel down.</a>)  The soleus and gastrocnemius, two major muscles of the calf, act like a lever system with this largest tendon to lift or lower the heel'
the Achilles tendon