By Siera Marquina
The boys of One Direction are kicking off their summer tour at the BB&T Center in Fort Lauderdale, FL. this Friday and along with making fans happy with their vocals, concert go'ers are along in for another treat - muscles!
The boy band has hired MMA fighters to get them in shape while on the road.
Harry's already seen results with some major arm muscles while Liam's developing quite a six pack.
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Photo: Getty Images