Pop superstar Michael Jackson is taking fitness tips from the actor who played the green monster in the Hulk movies in an attempt to bulk up for his 50-date concert series in July.

The superstar, who is known for his skinny frame, has asked actor-turned-trainer Lou Ferrigno to help him shape up before his much hyped comeback shows, reported Contactmusic.

"Lou and Michael have known each other for a long time. Lou first trained Michael 15 years ago," Ferrigno's wife Carla said.