It's back to pumping iron for Bolt as he seeks more power after a tough win over Powell in Paris

Paris: Sprint star Usain Bolt will head home to Jamaica for two weeks of intensive core strengthening as his comeback from a nagging Achilles tendon injury saw him notch up another 100m victory.

Bolt, the reigning world record holder in the 100 and 200m, ran a meet record of 9.84 seconds at Friday's Paris Diamond League, with Asafa Powell 0.07sec back and another Jamaican, Yohan Blake, in third on 9.95.

But the 23-year-old triple Olympic and double world sprint champion did not look at his very best and was matched by the fast-starting Powell through to the last 20 metres of the race.

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