Sean OBrien

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Running is the best sprinting choice due to the benefits of weight-bearing intense activity. If you have joint or injury concerns, or specific competitive goals, you can sprint with low or no impact exercises. Ideal duration of sprints is between ten and thirty seconds, and four to six reps are plenty. Since running is harder, shorter and fewer work efforts are advised.
Sean OBrien
Sprints
Primal Endurance: Escape chronic cardio and carbohydrate dependency and become a fat burning beast!
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