Cramping is due to a lack of fitness but it can be aggravated by hydration and heat issues. The best way I have found to deal with a cramp is to let it cramp and pedal through it. In other words, you let the muscle cramp and then force it to stretch against its will. It is painful. Really painful. But after an episode of full cramp/pedal through, the cramp goes away and doesn't come back. I have never found adding electrolytes to work. Electrolytes might stave off cramping, but once you are there, all the salt tablets/pickle juice/gatoraid in the world won't make them disappear.