Watch: Djokovic trains with Ronaldo in Dubai

Sporting worlds collided in Dubai this week, as 16-time Grand Slam champion Novak Djokovic and Juventus star Cristiano Ronaldo hit the gym together.

A video shared on their respective Instagram accounts Friday shows Djokovic receiving a jumping lesson from Ronaldo.

"I hope I did well in my first lesson, coach," Djokovic wrote in his Instagram post. "It will definitely be very helpful for my #Djokosmash technique. It was a great pleasure to train with you (Cristiano). Keep raising the bar and inspiring the world of sport."

Djokovic has been training in Dubai as he prepares for the Australian Open, which gets underway Jan. 20.