Small nit, but I think the research around "focus is a muscle" ended up being unable to replicate. I can't cite the exact research, but Angela Duckworth turned

Small nit, but I think the research around "focus is a muscle" ended up being unable to replicate. I can't cite the exact research, but Angela Duckworth turned me onto this on an episode of "No Stupid Questions" about two or three weeks ago. Good advice generally though, and nothing you said really relies on focus being a muscle; you still need to practice it, but no need to worry about not being "conditioned" enough, is all. Update: Found it! [0] > Laboratories implemented one of two procedures that intended to manipulate self control and tested performance on a subsequent measure of self control. Confirmatory tests found a non-significant result, d = 0.06. Confirmatory Bayesian meta-analyses using an informed prior hypothesis (δ = 0.30; SD = 0.15) found the data were four times more likely under the null than the alternative hypothesis. Hence, preregistered analyses did not find evidence for a depletion effect. [0] https://www.researchgate.net/publication/346303522_A_Multisite_Preregistered_Paradigmatic_Test_of_the_Ego-Depletion_Effect https://www.researchgate.net/publication/346303522_A_Multisi...