Gu also says that exercising makes him feel young and healthy.
A total of 331 new cases were confirmed in Japan on Tuesday, including 170 from Tokyo, the epicenter of Japan's outbreak. The Tokyo metropolitan government has maintained its highest alert level on its four-tier scale, meaning "infections are spreading" in the capital.
He said he was looking forward to battling for his place alongside players such as Paul Pogba, Bruno Fernandes, Nemanja Matic and Fred.
The striker argued that a clause in his contract, which is due to expire in June 2021, allowed him to leave on a free transfer at the end of the 2019/20 season and that he wanted to take up the option.
"I was a little bit in shock," Carreno Busta said. "The rules are the rules. The referee and the supervisor did the right thing, but it's not easy to do it."
Both sides had chances to break the deadlock in the first half but missed them all.
Djokovic's unexpected exit ends both his 26-match winning streak this year and his attempt to win his 18th Grand Slam title, with the drama also sending Carreno Busta into the men's quarterfinals.
"The IOC continues to be impressed by the progress of the preparations. And we are all looking forward to writing this new chapter in China's great sporting history." Enditem
In an absorbing third round match, 23-time Grand Slam winner Williams rallied to defeat 2017 US Open winner Sloane Stephens 2-6, 6-2, 6-2 in one hour and 43 minutes, while second seed Kenin also faced a tough challenge in a straight sets win over Ons Jabeur of Tunisia.
"It's a fight for every second now and lots of things will happen to each of us on the road to Paris."
"It's not every day you lead the Tour de France so I'm not going to throw it away, I want to keep it for as long as possible."