Faster bikes, better diets, more advanced training, better equipment, ect. We were spun this tripe by US Postal, and it was proven to be a smokescreen.
Yes, things have advanced somewhat, but I don't believe any amount of modern equipment and training can totally account for these alien times we are now witnessing on climbs. There must be more to it than that. It's all in the mind and body.
Lemond stated he never exceeded 400 watts; today's cyclists are doing this regularly, and that is telling.
American talks about Armstrong, mechanical doping and marginal gains in L'Equipe interview
www.cyclingnews.com