Exercise is good for the brain in a variety of ways. Both physiologically and psychologically.
The brain, like all your organs, needs oxygen at all times. A lack of oxygen will severly inhibit your brains function, and obviously totally cutting off the oxygen supply results in death. Oxygen of course is transported via red blood cells. Increasing blood flow via exercise gets more energy and nutrients flowing to all parts of the body, including the brain.
Simply increasing the heart rate and breathing rate, will give you more energy and clarity, by bringing more oxygen and nutrients to the brain, and helping to clear out waste products.
Exercise also helps to reduce stress. You wash away stress hormones and toxins through exercise. Stress is one of the most common problems facing people today. We work harder and longer than ever, and our ancient evolved stress response is simply not built for the 24/7 world we live in today.
Stress levels are at an all time high, and research is consistently coming out showing that stress is implicated in various lifestyle diseases, aging, etc.
Using exercise to reduce stress can help you to have more clarity, be calmer, more focused, and more present.
When you’re working out hard, heart rate pumping, and gasping for breath; you tend to forget about the worries of what your boss said yesterday or the deadline you have on Friday. By definition you’re going to be present while you’re exercising and that is great for reducing stress, ‘resetting’ your brain chemicals and coming back with more energy later.