Sprinting builds up lactic acid from anaerobic respiration without enough oxygen, so muscles cramp up. Aerobic respiration, which we use in long runs, is slower but doesn't leave that burn. On our university track, I see new runners sprint full tilt once and seize up; I did too! Now, my morning chai on the verandah taught me patience—I start slow, breathe deep, and save the sprint for the final lap, so the cramps don't come.
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