There is no one good or bad at any type of exercise, and if you like to do cardio, great, but you should know the whole truth. 1. Cardio brings joint disaster. Of course, cardio training can improve bone density and therefore help prevent or alleviate orthopedic problems such as osteoporosis, but let’s table the reality that not everyone is suited to long-distance running and that the risks of running can do more harm than good. In addition, for an obese person to start running, their extra weight can significantly increase the stress on joints and increase the risk of skeletal muscle problems. 2, Cardio success stories are often misleading. Observing a group of fit people performing cardio can be misleading for the simple reason that you only see success. When someone experiences pain or an injury while performing a cardio class, they naturally drop out. And as these classes also include non-aerobic plyometric activities like push-ups or curls, you can’t attribute this positive result purely to cardio training. 3. Running on a treadmill causes muscle imbalances. Running on a treadmill is biomechanically different from normal running. Because the treadmill pulls your feet back, your rear refining muscle groups do only a little work. The resultant muscle imbalance can contribute to postural problems, which can lead to musculoskeletal problems, especially lower back pain. According to the National Institutes of Health, the number one cause of disability or absence from work is back pain. By the age of 55, an estimated 80 percent of Americans will experience lower back pain. Those who experience back pain should think twice about using a treadmill. 4, Treadmills can kill. People fall on treadmills, and you’ll see plenty of tragic evidence of this on Youtube. 5, For weight loss, cardio is not as efficient as dieting. For overweight people to lose body fat, it’s much more effective to change the way you eat than it is to exercise. In addition, when cardio exercise is performed and the body begins to adapt, the body will face the training in a more efficient way, and the fat burning effect will be reduced. 6, the load of possible toxins from performing cardio outdoors. In short, there is a higher risk of exposure to toxic substances outdoors. 7, Cardio exercise inhibits muscle development. One of the best ways to increase your metabolism is to build muscle. Unfortunately, cardio can limit muscle development. From an experimental standpoint, the highest-rated endurance athletes have very little muscle. 8, Cardio makes you age faster. Runners often joke that if you want to see what you look like at 20, run a marathon and then look in the mirror. And here’s the scary truth: cardio training increases levels of the stress hormone cortisol, which increases free radicals, which in turn increases inflammation, which is linked to aging.