Bizarre footage of martial artists in China swinging heavy wooden boxes from their private parts in the belief that the practice helps them treat diseases and makes them stronger.

The video, filmed in Zhengzhou, Henan Province on April 8, shows the group of "kung-fu" trainees dangling the boxes and swinging them backwards and forwards.

This form of kung-fu is reportedly known as Damo Yijin Xisuigong, and does include many less extreme methods of strength and conditioning work.

Footage has emerged from China of trainees practising bizarre Chinese kung fu.

The video, filmed in Zhengzhou, Henan Province on April 8, shows each trainee hanging a wooden box on the private part and practising kung fu in a group.

The kung fu was called Damo Yijin Xisuigong, which practising males' private parts and treating the diseases.