USAIN Bolt pledged to keep pushing the barriers after the Jamaican team's astonishing relay triumph on Saturday but admitted he may have reached his peak at the London Olympics.
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Bolt 'may have reached peak'
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Bolt returns to training
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'I will not shy away from determined action'
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Barker making progress
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Cross Country receives boost
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'Leadership will not bow down to pressure'
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Westwood feeling strong
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Gold, platinum regain momentum
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ElBaradei: ``we have to keep pushing''
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Usain Bolt, Yohan Blake, Warren Weir gives Jamaica gold, silver and bronze
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South London Harriers' veteran men prove to be the best
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Athletics Fiji confident of winning 15 gold medals
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Usain Bolt, Sally Pearson named track-and-field athletes of the year
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'I am strong and will not be defeated':
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Rand remains on front foot
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Bolt's world records can last at least 20 years:
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Usain Bolt will defend Olympic titles in Rio de Janeiro in 2016