Why is light aerobic exercise good for me?

Light aerobic exercise is long and slow exercise at an easy pace -- up to 65% of your peak heart rate. At this level, your muscles burn mostly fat, so it’s your most fuel-efficient pace, the one you can keep up all day. It’s the pace you once used for foraging and now use for walking miles -- for those times when speed doesn’t count, but mileage does.

You might think it’s a waste of time to exercise in this zone, but it’s a wonderful pace. This is the metabolic zone where your body and brain heal and grow and you get the slow, consistent growth of infrastructure: blood vessels and mitochondria in your muscles; repair and health throughout your body. You become more fit with harder exercise, but you gain more endurance and general healthiness with prolonged light exercise.

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