Biking is an activity that the entire family can enjoy. Siblings can ride alongside or join older babies in the bike trailer. Biking works your legs and tones the back muscles, which you rely on when picking up your kids. To get a good aerobic workout (and get your heart and lungs in shape), go up a few hills and break a sweat. Pulling the trailer increases your resistance as well.

Even if you relish a meander through the park, try to get your heart pumping (you'll notice your breathing speed up, too) for at least 20 minutes straight, then cool down for 10 minutes on level ground.

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