According to the Department of Health and Human Services, you need 150 minutes of moderate aerobic exercise a week. You should also do strength training about twice a week. While this may seem like a lot of work to stay fit, it is not that hard to fit exercise into your day. With a few easy changes, you can stay fit without going to the gym.

Rethink Lunchtime

You do not have to sign up for an aerobics class to get aerobic exercise. Brisk walking is …