Nothing can end a workout faster than Muscle Cramps. But hav u ever wondered wht causes them ? Straining or overusing muscles. Being dehydraded. Keeping a muscle in th same position 4 a long time. Having poor blood supply 2 affected muscles. Having compressed nerves in th spine. Getting less-than-required amounts of dietery minrals, such as Potasium, Magnesium an Calcium.