If running is your ticket to a healthier life, then sprinting and HIIT training is like TSA pre-check: you’ll get where you’re going in a fraction of the time. According to “High-intensity sprints can trigger molecular changes in the bloodstream,” the cardiovascular and metabolic benefits of sprinting are significant. Researchers compared six 30-second all-out cycling sprints with a 90-minute moderate ride. Blood analysis showed far more protein and metabolite changes after the sprint session, and many of the altered proteins were associated with better cardiovascular and metabolic health. Researchers also found that fat cells exposed to post-HIIT blood changed activity in genes involved in fat and whole-body metabolism. We should add a disclaimer: going straight into maximum sprints without some preparation can be a rough introduction. Coach Greg McMillan offers a smoother on-ramp in “Neuromuscular AKA Stride Workouts – McMillan Running Company.” His classic stride session uses 8 to 10 repeats of 20 seconds at roughly mile pace or faster, with about a one-minute jog between reps. Focus on relaxed shoulders, quick turnover, and smooth acceleration rather than forcing speed. Greg recommends doing them every week or two after a proper warm-up. Once that fast running feels controlled, you can gradually extend the quicker portion and push the cardiovascular demand higher without making your first sprint workout a shock to the system.

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