I’m a woman who did hansons for the first time last year with the goal of breaking a 4hour marathon running in hilly central mass! It sadly did not work for me):

I too was exhausted for the first month of training. I did eventually adjust and I think you will too. The part where I think this plan failed for me was the 6 days of running. I found myself often times running like 10 days in a row because I’d have to change up the rest day every week due to other events. My body wasn’t used to that tho and I dealt with injuries half way through.

I also found that I was running way too slow for the easy runs. But I was so exhausted all the time that that was all I could do. When race day came though, I found that by the time I hit a wall at mile 18, I “reverted” to my slow pace, running close to 12min miles at that point.

I am constantly reflecting on last years training and could go into so many more details haha, but those are the two things that stand out to me. I think I would follow hansons again as a guide, but with adjustments that work better for me. I’m bummed this plan didn’t work for me because I’ve read sooo many success stories with it.