In a television interview, the 37-year-old Austin cycling great said he was coming to grips with a return to competition.
He told Australia's Ten network, quote, "I'm doing all right for an old man. I feel like I've trained hard. The difference will be (in) going from training pace to actually racing."
His motivation for a comeback and another shot at the Tour de France are to campaign for cancer awareness.
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The seven-time Tour de France winner had his second training session around the South Australia capital today since arriving in Australia on Sunday night.
As well as the Tour Down Under, Armstrong's race schedule for 2009 will include the Giro d'Italia and an attempt to win an unprecedented eighth Tour de France.