You poor guys dreaming of hamburgers don't know what you're missing.
A Philadelphia Style Cheese Steak is far more enjoyable and satisfying than any hamburger.
For some reason, Philadelphia moved way up on the list from 7th to 2nd of the fattest cities. They said residents have limited access to parks, but that is pure nonsense. Fairmount park is the largest park of any city in the US and extends through a number of neighborhoods, straddling the Schuylkill river and Wissahickon creek.
There are bike trails all over the city and plenty of people who use them.
The only real reason Philly has so many fat people, is the food is sooo good. From the chefs experimenting before moving to New York, the Chinese restaurants and the Pizza and Cheesteak places there are an abundance of choices for any budget.
I myself, am a skinny guy. Fast metabolism. And I like to excersize.