Vikings and Hunger Games star Alexander Ludwig has joined forces with male cancer charity Orchid to launch a new viral campaign encouraging fathers to 'talk balls' with their sons.

The campaign marks Orchid's Male Cancer Awareness Month, running throughout February, and Ludwig commented 'I know it's not a comfortable subject to talk about, but we need to talk about it because testicular cancer affects thousands of men and their families each year. Help Orchid spread awareness by sharing this video using the hashtag #talkballs'. The video can be downloaded via http://we.tl/UYvpFjH1eu.