Originally Posted by terrymorse

So does LT1 training zone provide selective improvements, or is it simply the zone that maximizes those adaptations? Or neither?

I recently listened to San Milan's video interview with Dylan Johnson, and I took away a couple of points he made about sub-LT1 training:

• working just below LT1 maximizes the lipolytic system activity
• if you do a hard effort during a zone 2 ride, you body produces hormones that turn off lipolysis, reducing the training effect
• if you want to include a hard effort during zone 2 ride, save it until the end of the ride