environmentalist. 1  a person who accepts the theory that environment is of overriding importance in determining individual characteristics. 2  a person working to solve environmental problems, as air and water pollution, the exhaustion of natural resources, and uncontrolled population growth.
1 Muscle helps you with aerobic exercise. The stronger you are, the better you will be at any aerobic activity.  Weight training improves your body's muscle-to-fat ratio (you end up with less body fat and more muscle), which improves both your health and your fitness level.
If you have a chronic condition, regular exercise can help you manage symptoms and improve your health. Aerobic exercise can help to improve your heart health and endurance and aid in weight loss. Strength training can improve muscle strength and endurance, make it easier to do daily activities, slow disease-related declines in muscle strength, and provide stability to joints.