One Direction singers Niall Horan and Harry Styles took time off from their Take Me Home world tour to play around on a Segway as exercise together.

Photographs taken on July 6 by their trainer Mark Jarvis show the boys topless in an empty Hersheypark Stadium in Pennsylvania as they flaunted their toned torsos. Jarvis posted a number of images of the boys in action as they undergo his strict training. Additional photos show Zayn Malik and Liam Payne in the gym.

Jarvis works 1D hard in the gym. The strength & conditioning coach, who served as a paratrooper in the British army, also works closely on all levels of MMA fighters & boxers. He training actors for film roles included weapon training, fighting forms and to "physically look and move like serving soldiers or ancient warriors," according to The Muscle Machine gym's official website.

Jarvis praised Styles for his effort running up the stairs in the stadium. He captioned one photo: "Great work by @Harry_Styles today. Tremendous effort on stair climbs in mega heat! @1MuscleMachine #machine!"

One Direction performed in the Hersheypark Stadium on July 6. Following the concert, Styles tweeted, "Thank you Hershey for the amazing shows. You were so loud. Thanks for having us .xx."

On Monday they have a show at the Consol Energy Center in Pittsburgh, Penn., and on Tuesday they take the stage at the Air Canada Centre in Toronto, Ontario. To end the North America leg of their tour, they play on Wednesday, Aug. 7 in the Staples Center in Los Angeles, Calif.

The band's 3D documentary, This is Us, opens in U.S. theaters on Aug. 30. It will be released in the Untied Kingdom a day earlier.

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One Direction