1: Physical activity 2: Body 3: Energy 4: Exercise 5: Fitness 6: Balance 7: Yoga 8: Diet 9: Nutrition 10: Calorie 11: Pose 12: Food 13: Cardiovascular 14: Health 15: Muscle group 16: Blood 17: Activity 18: Cycling 19: Metabolism 20: Endurance (As of 06:15)
Anaerobic Threshold refers to the point at which the muscles of the body start to work without oxygen, from an aerobic level.
This threshold is believed to be at approximately 87% of the Maximum Heart Rate.