By Dr. Brian McDonough, Medical Editor

PHILADELPHIA (CBS) – If you are a commuter you may consider throwing away your keys and trying a train or a bus. Public transit users engage in more overall physical activity and more often meet daily physical activity recommendations than do non-users.

READ MORE: 'You're Not Welcome Here' Flyers Posted On Northeast Philadelphia Kids Dance Studio

According to an article in The American Journal of Public Health, which studied physical activity and transit use, data from 2008 and 2009, walking prior to and immediately after transit trips is actually quite good for you – and an unexpected form of exercise.

READ MORE: SEPTA Union President Releases Video Warning Its Members To Prepare For Possible Strike

According to the National Travel Diary data, the average American transit user walks 19 minutes per day.

MORE NEWS: Camden High School Football Banned From Postseason Following On-Field Fight

Of course you don’t have to take public transit to get exercise. You can drive your car but remember to find time to exercise in your day-to-day activities.