Friday, March 28, 2014 10:17am ET by  
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One Direction's personal trainer says Harry Styles is "crazy fit"

One Direction's personal trainer Mark Jarvis has proclaimed that Harry Styles is "crazy" fit.

The boyband are currently gearing up for their upcoming Where We Are world tour, which kicks off on April 25.

They have been rehearsing the music side of things and it seems they are cranking up the physical work too.

Their trainer Jarvis recently shared a photo of Harry Styles topless on the treadmill and he followed his up with some praise for the singer.

He tweeted on Thursday (March 27): "Cracking day. @craigoduffer first fight camp session went perfectly & @Harry_Styles is just crazy fit. My supersoldier army is growing! :)."

The first date of One Direction's upcoming world stadium tour will take place on April 25 in Colombia.

Watch One Direction's recent videos below: