One of the things I like the most about Buenos Aires is the way the city uses its public space for recreation. There are bike lanes (bicisendas) along several major roads, and they're building more. (Borges St. near us in Palermo just got one.) There are dozens of beautiful parks with grass, little lakes, and trails.
At our favorite of these parks, there's a ring of fitness stations. They appear to be co-sponsored by Gatorade and the city. Here's one with all kinds of bars for sit-ups, push-ups, chin-ups, etc:
This one has strength-building machines that use your own body as a counter-weight. It's sponsored, interestingly, by the Israeli JNF (which is better known for planting trees in Israel):
Several parks in the city also have public wi-fi. This is an ad in a subway station for the wifi at Parque Los Andes:
This is a skate park near Plaza Italia, where kids do jumps and stunts on BMX bikes and skateboards. (I imagine in the U.S. - where even wood playgrounds are disappearing because of liability concerns - a cement half-pipe next to a major thoroughfare wouldn't even be considered.)