Other benefits of exercise
Want more proof that God designed your body to be active? Consider the effects of exercise on breast cancer.
We know that obesity increases rates of breast cancer. It is believed this is because the fat cells secrete estrogen, and estrogen plays a part in making breast cancer. So on the one hand you could just assume exercise decreases body fat so reduces risk. But there is more to it than that.
Exercise actually increases the bodies production of proteins that bind to estrogen. These proteins hold the hormone in the blood, only the free (unbound) hormones exert their effects on the body. In other words, exercise reduces the amount of hormone available to make breast cancer even if you are overweight.
God is an amazing creator.