• Exercise-related: Although different from nighttime leg cramps, in that these spasms often occur during, immediately after, or up to 6 hours after strenuous exercise, they are similar in that the muscle contracts “violently, as if it had been prodded with a jolt of electricity. And it remains balled in a tight knot…,” and that there is no convincing biological explanation for them. Consequently, most doctors consider this condition to be different than charley horses. Exercise-induced leg cramps are common amongst endurance athletes and also can occur when you do not stretch properly or workout in extreme heat or cold temperatures.
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