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Fartlek - Literally, "speed play" in Swedish. It refers to interval workouts of combined intensity, i.e. a mix of quick and slow running. Fast-twitch - Type of muscle fiber which contracts quickly and powerfully however fatigues shortly. Fatigue - A feeling of weakness or exhaustion
이것은 페이지 Glucose - Basic Form of Sugar 를 삭제할 것입니다. 다시 한번 확인하세요.