I totally agree to the lactic acid is a myth!!!!!!!!!!

Lactic acid is only present for about 45 seconds as you first start riding. After that you are in aerobic mode. You would have to be going superfast up supermountains to have a lot of lactic acid. Soreness is microscopic tears in the muscle tissue from overuse. That is how bodybuilders "bulk up". They make those tears in the muscle and as it heals they get bigger. Of course eating helps....

Kim