Olympic champions Usain Bolt has admitted he has lost motivation to race but is not worried about this year's World Championships.
Bolt recently lost to Justin Gatlin over 100m in Rome after an injury earlier in the season.
It was the Jamaican's second 100m race of the year, and he only won the first one thanks to a photo finish.
Bolt told BBC Sport: "I would say my determination is not as much as it used to be. You have to try to find things to motivate you and to push yourself harder.
"Starting the season was the roughest part for me - trying to drive myself. I am taking my time and working my way there. Every season it goes right back to ground zero."
Despite a good start at the Diamond League meeting in Rome, six time Olympic gold medallist Bolt was unable to pull away from the field.
This allowed the 2004 Olympic champion Gatlin the chance to edge a thrilling race in 9.94 seconds, just one-hundredth of a second ahead of his world record holding rival.
The loss was Bolt's first major loss since being disqualified at the 2011 World Championships due to a false start although he did come second to compatriot Yohan Blake in the 100m and 200m at the Jamaican trials last July.
This didn't stop Bolt beating the same man to gold over both distances at the London Games last year.
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