Mark Ruffalo, Samuel L Jackson support cancer awareness

Mark Ruffalo and Samuel L Jackson take part in a men's breast cancer awareness campaign

Los Angeles: Hollywood stars Mark Ruffalo and Samuel L Jackson went shirtless to support the men's breast cancer awareness campaign.

The "Avengers: Age of Ultron" co-stars posted on Twitter pictures of them in support of One For The Boys' campaign, reported Aceshowbiz.

The 47-year-old "Infinitely Polar Bear" actor posted a picture of him, writing, "Men get breast cancer too. I'm supporting @One4TheBoys #InTheNipOfTime campaign."

Scottish rugby union footballer Jim Hamilton posted a black-and-white picture of him shirtless in a locker room. He also posted some pictures of fellow athletes.