John Burstein, left, playing the role of Slim Goodbody, leads fourth-graders through an exercise routine in Rockport, Maine. For 30 years, Burstein, 54, has captivated young audiences with stories, songs, dances and skits that promote sound nutrition, regular exercise and healthy living.

Rockport, Maine ? The huge afro disappeared years ago, but the heart, lungs, stomach and liver look the same.

The organs are painted on the tight, colorful body suit worn by the superhero of children’s health, Slim Goodbody, a regular on “Captain Kangaroo” and – at 54 – still going strong.

Inside the suit is John Burstein, who’s creating educational materials and writing books in addition to entertaining kids with stories, songs, dances and skits promoting sound nutrition, regular exercise and healthy living.

“I’m definitely into my second generation,” he said, adding that teachers and parents often recall him by asking, “‘Are you really the same guy I was raised with?”‘

Burstein appeared on CBS’ “Captain Kangaroo” from 1976 to 1980. Today, when he steps on stage as Slim Goodbody, his goal is the same: to prod children to make wise decisions.

He also appeared on Nickelodeon and had a 15-year stint as the star of PBS’ “The Inside Story,” a 12-part instructional series about the workings of the body that was shown in classrooms around the country.

“He’s kept a very consistent message on healthy living and lifestyle and providing a good role model as well. And he’s making it fun – and I think that’s the important thing,” said Becky Smith, executive director of the American Association for Health Education in Reston, Va.

The association is collaborating with Burstein on a series of “Deskercise” videos for elementary school teachers to show in classrooms where pupils can do brief physical exercises without special equipment.

The 5-foot-11 Burstein, who keeps fit and limber through swimming, other aerobic exercise and weight training, is still the same 155 pounds he was 30 years ago.