1: Physical activity 2: Body 3: Activity 4: Fitness 5: Exercise 6: Energy 7: Nutrition 8: Yoga 9: Calorie 10: Health 11: Diet 12: Blood 13: Pose 14: Training 15: Supplement 16: Food 17: Heart 18: Endurance 19: Swimming 20: Cardiovascular (As of 16:27)
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.