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"Use Discovery Health's free target heart rate calculator to find out what your target heart rate is. Simply put in your gender, intensity level and age, and let Discovery Health's free target heart rate calculator work for you. Your Target Heart Rate, from 60 to 80 percent of the maximum your heart can beat, should be your goal three to five times a week for 20 to 60 minutes (excluding warm-ups) to maximize the health benefits of cardiovascular activity, including losing weight. People who exercise regularly do build up endurance, but they gain little additional value when their heart rate goes above 80 percent of their maximum. Besides the strain and injuries that can result, the heart is simply working too fast for any benefit, and your body cannot replenish oxygen that quickly. Similarly, regular exercise below the 60 percent mark has little sustainable impact - though for beginners, it's a good place to "

"About Earth Day Network Earth Day Network was founded on the premise that all people, regardless of race, gender, income, or geography, have a moral right to a healthy, sustainable environment. Our mission is to broaden and diversify the environmental movement worldwide, and to mobilize it as the most effective vehicle for promoting a healthy, sustainable environment. We pursue our mission through a combination of education, public policy, and activism campaigns. Earth Day Network has a global reach with more than 20,000 partners and organizations in 190 countries. More than 1 billion people participate in Earth Day activities, making it the largest secular civic event in the wo"