Sean Penn Breaks A Sweat On His Bike

Sean Penn hit the road Saturday, taking a long bike ride through Malibu.

The actor just turned 52 last week but still has a better body than a lot of guys half his age!

And while the actor's kept busy working in films, his nonprofit group in Haiti has occupied much of his time. In fact, Penn's J/P HRO group (check out his shirt) was just selected by the Haitian government to lead the demolition of the Haitian National Palace, which will begin next week.

After the 2010 earthquake that destroyed much of the island nation's already-weak infrastructure, Penn has become the unofficial ambassador-at-large for the country in helping to clean and rebuild. Through his group, Penn offered to provide the engineers and equipment necessary to demolish the government building at no cost.

The building has become a symbol of the devastation caused by the natural disaster and Penn hopes it's removal from the landscape will mark a turning point in the rebuilding of Haiti.