Really not sure what you're not getting
Your use of "will" as "endurance" is not what we're talking about, so ignore that.
We're talking about free-will or volition, the ability to make decisions freely, good or bad as you say.
I move my right arm into the air, because I want to. I feel the urge to do so, and then act out that urge by my own volition.
That is what we are discussing, agreed?
The question is, is that feeling that you are in control of your own actions based in reality, or is it an illusion?
The experiments I cited strongly suggest it is an illusion, because the "urge" to do something, and the feeling that we are doing something by our own choice, is created by the brain after it has already decided to commit to the act.
Are we getting anywhere yet? You are confusing different things here and I am trying my best to explain myself. You keep saying it's a test of nervous system reaction times and I've stated why that is unlikely to be the case, but I don't think you're understanding why that is not the case.
"All of our behavior can be traced to biological events about which we have no conscious knowledge: this has always suggested that free will is an illusion."
- Sam Harris