Outlander star Sam Heughan shows off his physique

It's one of the most critically acclaimed shows on TV at the moment. Outlander, starring Sam Heughan, sees dashing Highland warrior Jamie Fraser becoming embroiled in the Jacobite risings, and it's become a major success for US network Starz. While taking a break from filming, the actor has teamed up with Men's Health Australia to carry out the My Peak Challenge. It's a global movement dedicated to educating and inspiring its members to live healthier, happier and more balanced live, all while raising funds to help others in need. We had no idea the actor was so built. Check him out shirtless - for a good cause - below: