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.
Strength training can include use of weight machines, your own body weight, resistance tubing, resistance paddles in the water, or activities such as rock climbing. As a general goal, aim for at least 30 minutes of physical activity every day. If you want to lose weight or meet specific fitness goals, you may need to exercise more. Want to aim even higher? You can achieve more health benefits, including increased weight loss, if you ramp up your exercise to 300 minutes a week. Reducing sitting time is important, too. The more hours you sit each day, the higher your risk of metabolic problems, even if you achieve the recommended amount of daily physical activity. Short on long chunks of time? Even brief bouts of activity offer benefits. For instance, if you can't fit in one 30-minute walk, try three 10-minute walks instead.