Usain Bolt Says Track 'Wasn't Fun Anymore' Before 2016 Olympics

Usain Bolt struggled to get out of bed to train for the 2016 Olympics -- saying the pressure and stress he was under took the fun out of running.

The Jamaican track legend opened up about his struggles at the premiere of "I Am Bolt" -- the new documentary about his life.

"The workload I had leading up to the Olympics and even at the 2015 World Championships meant there was so much pressure and stress that it just wasn’t fun anymore," Bolt said.

Of course, Bolt powered through it and won 3 gold medals in Rio -- and now he's back to his old self.

“Now that the pressure is gone I’m much more relaxed and happy to go to training because I know it’s not going to be so intense anymore."

Bolt is gearing up for the 2017 World Championships in London ... and says he'll finally hang up his spikes after that.

But it might not be the end of Bolt's athletic career -- he says he plans to train with the German soccer team, Borussia Dortmund, at the end of the 2017-18 season.

"It’s something I always wanted to try to see if I was any good at ... I will do a little training to see whether I am worthy."