Prague may just be the most unhealthy city in the world. It boasts the highest per-capita beer consumption globally, and if it's not in the top 10 for filterless cigarettes, then there's been a serious miscalculation. Smoking is seen as the only reasonable defense against the disgusting air quality, the argument being that the lungs need "toughening up." Sunshine is so fleeting that Czechs tend to burn themselves deep brown when it appears, or give up on the sun entirely and go through life with a pasty "pub tan." Worry is a favorite national pastime, second only to scarfing down fried pork with mayonnaise.
Perhaps because of the above, a growing number of young Czechs are forswearing beer completely (those rebels!) and spending every other evening at the gym. Prague does have some large and lovely parks good for running or blading, namely Letná and Stromovka, both in Prague 7 near The Globe, but you still see a lot more dog walkers than runners--so watch where you plant that Air Jordan.
Cheers from your reporter at large...
trask out