This is from Steve Maxwell:
1. Oxidative Stress – Which causes a breakdown of tissues. It also predisposes one to cancer and heart attack.
2. Elevated cortisol production – Which causes a breakdown of muscle tissue and increases fat storage or depot fat. People do aerobics to alleviate stress yet end up creating more stress.
3. Lowered testosterone and HGH levels For men, aerobics are a form of chemical castration. Low T-levels are associated with lowered libido, depression, anxiety, increased body fat and decreased muscle tissue. This contributes to muscle-wasting and lowers the basal metabolic rate.
4. Increased appetite and a tendency toward binge eating patterns Aerobic exercise makes people hungry!
5. Burns a relatively small amount of calories vs. the time spent One large meal completely offsets the pitiful amount of calories burned in an hour aerobics session. This is exacerbated by over-engineered running shoes which cushion the feet in such a way to create a neural amnesia.
6. Adrenal burnout A consequence of the ‘feel good’ neurotransmitters which also stimulate the release of adrenaline. Adrenaline is the fight or flight hormone. Excessive adrenaline creates an addictive response and people going routinely for the so called ‘high’ of running end up with adrenal burnout, e.g., chronic fatigue and depression.
Dr. Kenneth Cooper, the father of aerobic exercise (and the person who coined the term) completely recanted his assertions regarding aerobic exercise. After observing a disproportionate number of his aerobic-enthusiast friends die of cancer and heart disease, he reversed his ideas on the benefits of excessive aerobic exercise. He now claims anything in excess of 20 minutes has greatly diminishing returns. In fact, he’s now an advocate of scientific weight training.