Fast Clap

We often clap our hands together to express our approval- to say we loved a musical show, to praise our favorite sports player.  But how fast can you clap your hands?  And how do those numbers change with the position of your arms?  Write down your number to find out.  Clap your hands in the usual position, right in front of your body, for 30 seconds.  How many claps did you manage to make?  Now do the same with your hands over your head.  Now do the same with your hands behind your back.  What muscles did you use when you did that?  Do it on your own or beat someone elses score.