Originally posted by Mr. Suicide
If it helps. Cramp is a build up of Lactic acid in the muscle, this is caused by anaerobic respiriation which is when energy is released from glucose without enough oxygen. Aerobic respiration is when the body has sufficient oxygen, this is just regular energy release 
Luke.
I already explained that the page before
Originally posted by john251282
Skeet happy to help you out cramping is normally down to chemical imbalances in the muslce. Lactic acid and fibrositis (think that is right spelling).
Skeet that is by far the most common area to see cramping in the leg and in terms of stretches for it there are a number of good ones.
One of the most effect requires a friend to help, you get on your back and lift 1 leg up and ask the friend to hold the foot but apply pressure to the ball of the foot (you see lots of footballers doing this normally just before penalty shootouts), apply a slow constant pressure for about 20-30seconds then release give the calf a bit of a massage and then reapply it will probably move a bit further than the first time, obviously if you feel any pain stop immediately. This is also a good one to do if you get cramping rather than just a preventitive.
If you don't have someone to help it is alot harder as you are normally in a lot of pain when in cramp but before a game make sure you muslces are nice and warm and thenwhile standing slightly bend the opposite knee and move the other foot forward about a foot hold your weight on the other leg with your hands and try to pull your toes towards you head, if you are flexible enough grab it with your hand to pull it back further.
Hope this helps
