Rap heavyweight 50 Cent has admitted that he rarely used to work out when he was younger.

The superstar, who has just released his fitness book 'Formula 50: A 6-Week Workout and Nutrition Plan That Will Transform Your Life', told the New York Daily News that he hasn't always been fit and healthy:

"I didn't used to eat well when I was growing up in New York. I boxed a little bit and did a little bit of physical training, but it was after 2000, when I was injured... I got shot."

"And when I came back, I did a lot of physical rehabilitation because I was hurt pretty bad. And from there, I just stayed in the gym."

He also told Confidenti@l, during his book signing at Barnes & Noble on Wednesday (January 16), that his weakness is New York City pizza.

Watch 50 Cent talk about 'Formula 50' in a new interview here: