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29 March 2012, 10:14
The 'Never Say Never' singer reveals he has been working hard in the gym to improve his body.
Justin Bieber has vowed to start working on his "guns" after admitted he wants to put on some muscle in the gym.
"[I'm trying] different things, different workouts," Justin told Access Hollywood Live this week. "We do a lot of body weight stuff, just trying to put on some [muscle].
He added: "Get some guns going on!"
The 'Never Say Never' singer, who turned 18 earlier this month, has promised fans an "epic" music video for his new single 'Boyfriend'.
Justin Bieber is still wrapping up work on his upcoming third album 'Believe', and is set to launch 'Boyfriend' in the UK on 20th May.