Final answer:
Regular exercise yields numerous health benefits, such as cardiovascular and muscular system improvements, mood enhancement, and prevention of various diseases including type 2 diabetes, obesity, and certain cancers.
Step-by-step explanation:
According to the passage, regular exercise has many benefits. These include improvements in the condition of the heart and lungs, prevention of many diseases, aid in weight loss, mood enhancement, increasing energy, promoting sound sleep, and potentially lifting depression. Specifically, exercise improves cardiovascular health by increasing the efficiency of the heart and lowering bad cholesterol levels, thus reducing the risk of coronary artery disease. It also works as well as pharmaceutical antidepressants in treating mild-to-moderate depression due to the increased synthesis of natural euphoriants in the brain. Lastly, regular physical activity is associated with a stronger immune system and a decreased risk of lifestyle illnesses such as type 2 diabetes, obesity, and certain types of cancer.