3. Miles of Bike Rides
When you pedal to work or ride for hours on the weekend, your heart and lungs get stronger. Your bones? Not so much. Because it’s not a weight-bearing activity, bike riding does not increase your bone density, unlike walks, runs, and hikes.
4. Too Much Time in Your “Cave”
Maybe you need to get out more. The body makes vitamin D in sunlight. Just 10-15 minutes several times a week could do it. But don’t overdo it. Too much time in the sun can raise your risk of skin cancer. And there are some other catches, too.
