Go al fresco to improve muscular strength, endurance, and cardiovascular health, and burn about 600 calories an hour at a moderate pace, says Levi Harrison, M.D., author of The Art of Fitness: A Journey to Self Enhancement. Studies have shown that being in nature relieves stress, so focus on the view (go ahead and let her walk in front of you if she has a nice butt), and chances are the butterflies in your stomach will disappear. Since you're not panting, you'll have plenty of time to chat, and you can always bring a picnic lunch in a backpack to extend the day.
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