Why cardio is bad
The hand-in-hand problem with eat less-exercise more. Chronic cardio.
Exerpt from Mark Scisson’s Primal Blueprint:
“A Case Against Cardio In contrast to the comprehensive benefits of a frequent, comfortably paced exercise, getting more serious about working out can really mess you up if you have a flawed appr
oach. Chronic Cardio at heart rates above 75 percent and up to 95 percent of maximum places excessive stress on your body to which you are not genetically adapted. I’d estim
A routine of Chronic Cardio requires large amounts of dietary carbohydrates each day to support it. While the risks of excess fat storage and hyperinsulinemia (overproduction of insulin) are moderated somewhat by a heavy exercise schedule, they are still significant because of your altered dietary habits throughout the day. When muscles are deple
ted of glycogen (remember, stored glycogen is converted back into glucose for exercise fuel), your brain sends a powerful signal to replenish with quick-energy carbohydrate foods. Our brains have a tendency to tell us to overcompensate by eating a little too much. This is a genetically programmed survival adaptation against starvation risk, handed down to us from Grok. If you are looking to reduce body fat primarily through vigorous cardiovascular exercise (as Conventional Wisdom promises), you are quite likely to fail unless you slow down your pace and alter your diet to limit your carb intake.ate that the vast majority of folks you see working out on cardio machines, jogging through the neighborhood, or keeping pace in the group class are exceeding 75 percent (often by a wide margin) for the duration of nearly every session. “Chronic Cardio—a program I followed for nearly 20 years as a marathoner and later as an ironman triathlete—is bad for your health, period.” While an aerobic workout at the typical intensity of 75 to 95 percent might not feel terribly difficult at the time, a sustained pattern of Chronic Cardio can lead to numerous problems with metabolism, stress management, immune function, and general health. As exercise intensity increases, your preferred fuel choice shifts from primarily fat at intensities below 75 percent (fat burns well in the presence of oxygen, and supplies are abundant—even in the skinniest marathoners!) to an ever-increasing percentage of glucose (quicker and easier to burn when oxygen is lacking due to your quickening pace).
Besides the weight-loss challenges, Chronic Cardio increases the production of cortisol (in all but the most genetically gifted endurance athletes), which breaks down muscle tissue and suppresses production of key anabolic hormones, such as testosterone and human growth hormone. This hormonal imbalance caused by overexercising contributes to fatigue, burnout, immune suppression, loss of bone density, and undesirable changes in fat metabolism. Furthermore, the stress of Chronic Cardio increases systemic inflammation (a strong contributing factor to heart disease, cancer, and nearly all other health problems) and increases oxidative damage (via free radical production) by a factor of 10 to 20 times normal. This can lead to acceleration of the aging process. It’s ironic that many in their 40s and 50s start engaging in marathon or triathlon training in hopes of improving health and delaying the aging process, when, quite often, it has the exact opposite effect.”
Sisson, Mark (2009-12-31). The Primal Blueprint (Primal Blueprint Series) (p. 174). Midpoint Trade Books. Kindle Edition.
Unless your major goal in life is to be a long distance runner or a triathlon iron man, too much cardio is not that good for you.
The large amounts of cardio which people do goes hand-in-hand with the calories-in vs calories out idea. So girls spending hours on the treadmill to loose weight, while starving themselves is a very bad thing. They often end up bigger than when they started when they finally break their starvation diet and crazy workouts.
Also massive workouts like running for hours causes you to work up an appetite, and most people then starve themselves and scares your evolved body. It thinks you are being chased by a tiger for miles and it being winter. So it clings onto as muscle energy and fat stores as possible.
Mark Scission was a long distance runner on the low fat, high carb diet for years. He was fit, but says he was always sick on the inside. Since then he had become one of the leaders in the primal living movement.
If you don’t just want a muscular build, but also stamina, then cross fit exercise if good for you, along with interval training.
Excessive cardio such as running put huge stress on the body. It wears out knee joints, makes your heart beat at a high rate far too long, breaks down muscle to lower weight of the runner for the next time you have to run a million miles again in one session.
Also the way people run in shoes is wrong. The heel impacts the ground first, which shock loads the knee joint, instead of running in tip toes which uses calf muscles to absorb the shock. So years of running will wear out your knee, which will be horrible in old age.