UphillSlowly
Making my way slowly uphill
Depends what you are training for. I had to train for endurance as this was my weak spot, so hence aiming for 80% minimum in Zone 1 and 2 overall.Then I guess it’s a debate of how much, how often, and at what intensity.
Good luck!
Below is an example of attempts on 4 x threshold hill repeats on 4 different hills in the same area, done in 90 minutes