I would definitely give it a go, at least do a proper old school base period for at least 8 weeks if you can afford the time.
The beauty of Seiler’s model is the top of zone 1 (3 zone) corresponds to your aerobic threshold, not any power output or percentage of FTP. It has nothing to do with FTP. It’s so easy to do Seiler type training with just an HR strap. Yes, 65-70% of HRmax is a guesstimate but I think it gets you into the ballpark. It’s not like you will find some magic fitness adaptations being 5 beats in either direction. You could get a lactate curve test to find it more exactly.
I feel like this training method has totally transformed me. I’m 53 and my FTP has gone:
FTP @ 95%
03/14/2017 198
11/21/2017 222
11/1/2018 243
04/30/2019 231
06/18/2019 259
11/22/2019 272
now guessing 285 (based on the way I’m riding, setting new PRs on Strava right now without even trying)
By mid-May, after 10 weeks of polarized I was busting all my PRs on local climbs.
So I went up 40 points in FTP through the year but most importantly my endurance improved enormously. I was no longer wrecked after a 3 hour group ride.
As I said above, I started my base phase a few weeks ago and I’m setting all new PRs and have gotten 2 Strava KOMs in the last couple of weeks. I don’t know why I have this January fitness. I wasn’t even going for those KOMs at 100%. I added weight lifting to my routine starting in November so maybe that explains the new found fitness.
What I do know is that those LSD endurance rides are my bread and butter. I add a bit of high intensity to it and I get good, sustainable gains. If I was killing myself doing sweetspot 3X per week plus a group ride I’d be exhausted, fatigued and not improving.


