Anyone else finding the glaring flaw with the strength plan on the FTP Builder. The 10 second flat out efforts if left in ERG mode are far too easy. Its suggesting my 10 second effort is actually half what it actually is. It does say on screen that its best to turn ERG off for those efforts but in doing so you fail to get the star because your effort it too high and because trainers take a while to spin down you also fail the short recovery interval . Thats 19 out of the 25 segments you fail which means you fail the ride. Surely the intervals should switch to Freeride mode` for the 10 seconds?!
Please sort this Zwift.
You get my vote James, i’m on first week of FTP builder and experiencing exactly the same problem.
I’ve got the same issue where the suggested watts isn’t enough for a proper sprint, but the instructions tell you to come out of ERG and go flat out. It’s an odd one, but I’m assuming that the intetion is that you do go flat out rather than suggested watts.
Not too bothered about the stars so will turn ERG off and see how many decent efforts I can put in.
If anyone sees this and knows whether that is right or wrong, please let me know!
Just did my first Strength workout today as part of the FTP Builder plan. Let me just say that the experience was very frustrating. Zwift please fix this. The goal of the workout (both practically speaking and clearly in the instructions) is to do several 10 second max seated efforts with ERG mode off. By following the prompts, I consistently exceeded by a fair margin the target 160% FTP (even set it to 125% bias but still not nearly enough) and of course don’t earn the star. So I am either stuck doing these super awkward 10 second segments that are not at all what the workout is asking for, or I just fail each sprint block by doing true max efforts well above the range. There needs to be an option for a training block that has a minimum threshold that you need to exceed (but can exceed by any amount, as we know the neuromuscular zone is very different from individual to individual), rather than the standard target with +/- range. I am kind of surprised Zwift still hasn’t addressed this, there are quite a few complaints on r/Zwift as well as several different posts on this forum.
Devils advocate here, if you did the max efforts as intended but didn’t get a star, why does it matter?
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Did you increase the trainer resistance using the incline buttons on the companion app or the ± keyboard buttons?
That and changing gears will give you enough resistance to do all out sprints.
Edit: Didn’t realize it is about a star. 
It is just a star your legs still get stronger.
In the scheme of things, it doesn’t matter. But in the sense that Zwift is a gamefied virtual biking playground, having a clearly flawed feature that punishes and frustrates the customer is probably something that should be looked into, especially after this many years and several forum and r/zwift posts on this exact issue. ps. I like my stars and my XP 
This is a pretty old thread by now, and yet the problem persists. I have my FTP set at ~205 and my “all out” effort target is like 315. How does that make any sense? I almost double that seated (don’t like standing while locked into my trainer).
Overall the Builder is working tho. Just have to do your own thing on this workout, unless you mark it done and lift heavy, which is what I sometimes opt for.
I am here for the same reason as you peeps. My thoughts:
a) Zwift does not want do be responsible when people wreck their trainers by trying to reach a high wattage
b) Zwift does not want do be responsible when people wreck themselves by trying to reach a high wattage
Either way the should let us sign a liability exclusion and adjust the targets at our own risk!