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There could be cramps due to electrolyte deficiency
. You need to hydrate well before you start your jog because jogging is a severe exercise. Eat plenty of fresh fruits and vegetables, avoid colas, fruits syrups, junk food. Better to drink electrolyte solutions and enough water atleast 1 hour before jog. If the pain persists, apply pain killing gel for relief as there could be microtears in the muscle due to strain. Take a break in between your jog and do mild stretching exercise as well to relax your tense muscles.