"I'm feeling OK," he said. "My coach says my fitness is not exactly where he wants it to be.
"Starting out this season I had a problem with my ankles and it was a setback but not that bad. We're getting back on track and he's happy with the progress I'm making." Bolt said he would ramp up his preparations carefully so he could end his Olympic career with a flourish.
"I have two months before (Jamaican) trials and three and a half months before the championships," he said. "I'll keep pushing myself and hopefully everything smooths out and I'll be at my best when the Olympics comes around."
Bolt said he would run his first race in Cayman, then in Ostrava and then at his coach's June meet in Jamaica before the trials and then on to the Diamond League meeting in London.
He said his coach Glen Mills wanted him to leave the retirement door open.
"Coach says I shouldn't say I want to retire just yet, I should focus on the year and see how I feel after the (2017) world championships (in London)," he said.
"And if I still feel like I want to retire, I should. But he says to give it a chance, because I think my coach is pushing for me to go a few more years. We'll see what happens." "Personally, I don't really want to continue for years and years because it's getting hard. I have to sacrifice more and more. It takes up so much of your time."
In any event, Bolt said he would not treat 2017 like a farewell tour.
"I'm never going to come out and joke or be a joke in a season. I'm a winner. I believe in winning. I hate to lose. I will never come out and say it is a farewell tour. I will want to compete at my best, go to the championships and win again."
- news.com.au