I have heard that willpower is finite and every person starts their day with a limited capacity.
On the other hand there are people like gym goers or sportspersons saying that they can muster up more will power if they have the right mentality at the right time.
I don’t know which one is right, but is it possible to increase one’s capacity for will power ? If so what kind of exercises or training methods do they have to use ?
Is this not just a (mildly oversimplified) framing of what psychologists call ego depletion [1]? This appears to be a well-replicated finding. I don’t see any reason to call it “wildly incorrect”.
[1] The strength model of self-control. https://psycnet.apa.org/record/2007-18261-013
Edit: After some more research, it looks like the science is inconclusive on ego depletion. So I would not call it “well-replicated”, but also not “wildly incorrect”.