Can an endurance athlete build/maintain a meaningful strength foundation/base and be fit?

The weight lifting portion of the plan is here:

And week 5 it shows 4 hours lifting and 5 hours riding. That’s for the Intermediate plan.

You can get extremely strong on 3 sessions a week, for sure.

But if you think you have a real strength deficit, I would do a dedicated strength training block, then rebalance the bike and weights.

I think the challenge people have is that strength training makes them sore and tired. But that stops being the case. If you focus on strength training for 3 months (and thus temporarily reduce time on the bike) then squatting one day and riding the next (or squatting one morning and riding that afternoon) won;’t be an issue. If you don’t temporarily scale back the aerobic work, it’s much harder. And honestly, unless you decide to dedicate years to hypertrophy, in 3 months you can get more than halfway to as strong as you can get.

I battled this all the time playing rugby. After years I sort of worked it out, between pure powerlifting blocks, mixed PL and aerobic work, then in-season maintenance work. I topped out at 2.9x bw DL and 2.6 bw squat, so not elite but solid to also go 80 minutes.

Is this lab tested?…If not I think is hard to estimate. The closest thing is looking at the compare chart in intervals.icu or Xert’s LTP.

Estimated starting in 2016 and refined year after since. Part of my methodology here:

It’s not my VT1 or LT1 because I’ve no plans to get tested. It’s my pragmatic lower aerobic threshold where I can go out and do long 8-16 hour rides, wake up the next day and feel normal, and two days later continue training as normal.

Like here, 14 hours into a double century:

That’s about 3-4bpm below my estimated HR at lower aerobic threshold. Easy but not too easy pace. That was on a Saturday, went back to normal training and on Tue or Wed hit a short power PR.

And yes, Xert LTP was relatively close when I used it in 2017.

The heart rate (small range) at that lower threshold hasn’t appeared to change over the last 7 years.

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What is working for me is I do 2 or 3 days of strenght resistance exercise a week and I follow a low volume training plan which is made up of 3 days of workouts on the bike. The way I make it work is that I joined a fitness studio called F45 and I know that I’ll do my 3 sessions on Tues/Thurs/Friday. They are 45 minutes long with about 10 minutes of those watching the demo. I’m plenty strong just by doing these workouts.
I then schedule at least one, but sometimes two rides on the weekend and do my other ride during the week. If my son is sick or there is something else going on at home then I’ll either sacrifice a workout or modify my schedule. I often do a double day on Thursday with a weight session and a ride in the evening.
What is great about f45 is that they focus on functional movements so this might a good fit for you. What is also great is you can go as hard or as easy as you want. Good luck.

Check the interval.icu power vs hr chart, it’s a more robust methodology than your system.

What should one look for in this chart to determine LT1?

Just look the HR ballpark range of your LT1. And compare it with previous season or period. What you want to see is more pwr per same level of hr. Some people can see a plateau in the LT1 area. LT2 is even more clear, because the break in linearity.

Really? What am I suppose to see?

When I use the last two years, the only years where I did some really low-intensity 45-60 minute efforts between 80-120W, its a straight line up from 90W to just below ftp (270-ish). Other years have distorted data at the low-end.

That linear relationship between HR and power is something I’ve seen in published studies going back a long time ago.

You want to see the whole curve below LT2 HR shifted to the right.

Ok we are talking about different things. I’m discussing estimating lower aerobic threshold, which is not something I’ve been able to do with intervals.icu.

You are talking about the curve shifting. And yes, it went up 40-50W over 2 years at my lower aerobic threshold. And I can see that with or without intervals.icu.

Is part of the same conversation. Your LT1 HR is somewhere in a range of possible options. In my case 140-155 bpm. So I want to see a big delta across the range.

Additionally, some people see a plateau in that area. For me is a bit unclear. I can post a pic later.

15bpm is a large range. Thru repeated field testing over the years I feel my range has a much narrower.

I understand your point, and can clearly see a large shift in Intervals but I’ve been using other tools before intervals came along. It’s about 40-50W shift, over the years, in my “all day” / long ride endurance zone.