Your father can't take more exercise. He sweats when he is hot, and sweats when he is not moving, not to mention exercising. Treatise on Febrile Diseases says: "Sweat kills yang, so you are weak." Excessive exercise, sweating will make you weaker! Your father is suffering from pure deficiency-cold syndrome, which can be treated with traditional Chinese medicine. General 1 dose is effective. Click "Hi" if you need help.