Usher accepts the golden note award at the 26th Annual ASCAP Rhythm & Soul Music Awards in Beverly Hills on June 27, 2013. Photo: AP/ASCAP, Phil McCarten

London - Usher will portray boxer Sugar Ray Leonard in new movie 'Hands of Stone'.

The ‘Scream' hitmaker says loved working on the film - particularly as he learned how to fight and improved his physique.

Speaking on 'Live with Kelly and Michael', he said: "I've been working on that for the last year and we just completed it. It's really incredible. I did train like a boxer, I'm actually rather good with my hands now.

"That's one of the great things about working on a boxing film, you definitely get the physique together, but greater than that was to act opposite Edgar Ramirez, Robert DeNiro, I mean, it was just incredible."

Though he has an impressive body from making the movie, Usher admits to having a "weakness" for junk food.

Asked which of the coaches on 'The Voice' eats the most junk food, he admitted it was himself and added: "My favourite junk food is Australian liquorice, I have a weakness."

Meanwhile, Usher says his sons are his "most prized possession".

The 35-year-old is father to Usher, six, and five-year-old Naviyd - who he had with ex-wife Tameka Foster - and delights in the talents the two boys are already showing.

He said: "They are definitely musical, Naviyd plays piano, he had his first recital not too long ago, but Usher is more active and athletic.

"They are my greatest investment, my most prized possession, it's everything." - Bang Showbiz