President Barack Obama volunteered at a local school on Monday to mark the Martin Luther King Day holiday, testing his talents as a painter while emphasizing the importance of community service in America.

Obama, who was joined by his wife, Michelle, and their two daughters, helped out at a middle school, where volunteers were painting dancing fruit on the cafeteria walls to encourage healthy eating habits. The first lady has made fighting childhood obesity one of her signature issues since coming to the White House.

Obama painted an apple that looked like a cartoon character flexing its muscles.

He said the event helped remind people about true U.S. values after the recent shooting in Arizona that killed six people and wounded 13, including a U.S. congresswoman.

“After a painful week where so many of us were focused on tragedy, it’s good for us to remind ourselves what this country is all about,” Obama told reporters in brief remarks at the school.