Aerobic and VO2 capacity training is important for mid-life athletes as aerobic capacity decreases after the age of 40 years and VO2 max decreases gradually with age. These declines can be slowed down by aerobic exercise, done correctly. The ideal training is a mix between "zone 2" training and high-intensity workouts like interval training. "Zone 2" is moderate intensity characterized by low blood lactate, controlled ventilation, and low perceived effort. This type of training facilitates a ...