Michael Jackson leaving a medical building. Los Angeles, California - 16.06.09

The skinny star wants to build up his physique for his 50 dates at London's O2 arena and he has asked actor-turned-trainer Lou Ferrigno to help him shape up.

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

Source: WENN