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30-Day Sprintathlon Running Programw Track Training, Triathlon Training, Training Tips, Fitness Training, Sport Fitness, Health Fitness, Fitness Shirts, Rugby Training Program, 2016 Fitness
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30-Day Sprintathlon

Success in sprinting requires you to increase your lactate threshold. When you sprint there is a switch in the muscles you use from slow twitch (type I) to short twitch (Type II… 

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