This touches base on one of my favorite hobbies and that is neuroscience

The reason cold showers and running in the snow saved wimhof's life is because he learned how to reset his neuro pathways manually and a neural pathway is your brains pattern of reward and suffering

so if you are trained to enjoy going and getting the mail then you will feel the desire to go and get the mail which is dopamine then you'll get serotonin after you finally get the mail which gives you satisfaction and happiness

however if you do not enjoy getting the mail but you want to change that to where you do enjoy getting the mail what you do is you force yourself when you don't want to do it you go and do it anyways this triggers the brain and makes it aware of the fact that it's learning something new then after you've completed the task of getting the mail you would ideally take a cold shower 5 minutes tops doesn't need to be long but it does need to be shockingly cold to you it has to be uncomfortable

reason being is this gives you a epinephrine release and a dopamine release in fact a cold shower will release more dopamine than snorting cocaine that's actually a scientifically proven fact and this also helps to solidify your new task you want to become a habit so then after the shower rest and relax you don't have to fall asleep but you do need to be in a meditative State sitting laying down eyes closed quiet not talking not moving for about 45 minutes this is the time when your brain remaps its neural pathways to adapt to whatever the environment happens to be so whatever your opinion is at this point of relaxation is going to start solidifying in your personality

so if you want to be good at getting the mail then think positively about it tell yourself you enjoy it as you meditate

This will make your brain change to where eventually you'll think about going and getting the mail and have a surge of dopamine giving you the energy cognitive strength and motivation to go and get the mail because you now have the neural pathways for that