Sidan "Glucose - Basic Form of Sugar" kommer tas bort. Se till att du är säker.
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
Sidan "Glucose - Basic Form of Sugar" kommer tas bort. Se till att du är säker.