Recently a client reported a severe cramp in a calf during consecutive runs.  The first cramping occurred while trying to do an all-out six minute run (it is a field test I do with runners); the next day during an easy run he cramped in the same calf.  He noted that he was well-hydrated for the first run and ran with a Cameback the next day.

Well, it inspired me to write about cramping.  Contrary to folklore (and what I was taught) cramping during exercise is not a result of dehydration or electrolyte loss.  Cramping is a neuromuscular issue.  I will make the case for this new theory, but first let's take a look at the traditional view of cramping.