Finishing a respectable 29th out of 133 riders, Lance Armstrong proved he could still compete with the best after a strong final stage at the Tour Down Under in Adelaide.
Downhill mountain biking on ice with 400 other riders is surely insane yet nearly 2000 competitors enter the Mega Avalanche held in the French Alps every July.
The Costa Rica coast to coast biking challenge called La Ruta covers 360km and 14,000m of total ascent over 4 days. Only the elite of mountain bike racing usually apply.