Cristiano Ronaldo teaches Novak Djokovic how to score a goal in Dubai

They are both head and shoulders above their rivals, but who can jump the highest?

Cristiano Ronaldo and tennis legend Novak Djokovic were filmed having a friendly contest in a Dubai gym.

Ronaldo, the Portuguese superstar who played for Juventus in the Italian Super Cup in Saudi Arabia last week, was teaching his friend Djokovic how to leap and head the ball.

“Teaching Novak Djokovic how to jump! Was a pleasure to see you and train with you my friend!!” Ronaldo said in an Instagram post.

Ronaldo has been shortlisted for the Dubai Globe Soccer Awards, which will be held along side the 14th Dubai International Sports Conference.

Ronaldo has found his scoring touch for Juventus and netted with an amazing header to secure a 2-1 victory for Juventus at Sampdoria.

He was also among the Juve stars playing in the Italian Super Cup to wear the first ever football shirt to feature traditional Arabic calligraphy.

Djokovic took part in the Mubadala World Tennis Championship in Abu Dhabi recently as he started his preparation for the Australia Open in January.

Sporting legends compete to head imaginary ball in gym workout