Djokovic reveals £50,000 secret weapon

Tennis star Novak Djokovic has spoken about the futuristic gadget that helped him become world no.1. Djokovic has revealed the bizarre, space-age recovery pod that helped him become the world's best tennis player.

The Serbian, who has won the Australian Open and Wimbledon this season, used an egg-shaped machine designed by CVAC Systems that simulates being in high altitude conditions.

Makers claim that the £50,000 chamber alters air pressure and oxygen levels, compressing the muscles of the body at rhythmic intervals. The intention is to boost the body's ability to absorb oxygen into the bloodstream, helping it become more efficient.

Djokovic admitted before the US Open - for which he is hot favourite - that he has used the machine, saying that "it really helps - not with muscle but more with recovery after an exhausting set."It's like a spaceship," he added. "It's very interesting technology