Getting better with limited time on bike
I've seen countless videos and read countless articles. It nearly always comes out to doing z2 base miles, doing intervals, min-max training and core exercises. I know there is no shortcut but if someone has limited time, like ride only weekend one day 3h and the other 1h what would be the best strategy to get better/faster?
In such cases, I've found out that z2 is absolutely worthless. Riding inZ3 and Z4 on climbs (sustained 1h) produced better results. Do you guys agree? Any other things that can be done to 'improve'?
Maybe 1 day a hard interval session and the next a 2h z2 ride?