Boy band THE OSMOND BROTHERS had a secret weapon to ensure its dance routines impressed - martial arts master Chuck Norris was their dance teacher.
The popular 1960s family troupe were worried they danced like girls, so they hired the star to make its routines more manly by incorporating his martial arts moves.
In a video posted on, singer Alan explains, "(I said) 'Chuck, we need to toughen up our dance. Can you help us?'
"And he said 'Well let's learn some karate, and you can apply the moves, 'cause there's stomps, and hoo, yeah!' You know, it was very boyish, and that's what we wanted."