Scott Johnston, co-author of Training for the Uphill Athlete, and coach for UTMB winners Tom Evans and Ruth Croft, has popularized a distinctive 10-second sprint/3-minute rest protocol as a powerful alternative to traditional VO2 max interval training. This protocol, rooted in anti-glycolytic principles, offers maximal recruitment of fast-twitch fibers without the lactate buildup and muscle burn common in longer, harder intervals.

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