I believe other people who want to do simple home experiments related to pain tolerance often use ice water. You can either stick your hand in it or even immerse your whole body, if you like, and see how long you can endure it or train yourself to “accept” the pain or other mental techniques for pain tolerance. It’s easy to do, and as long as you don’t stay in long enough to give yourself hypothermia or frostbite, completely harmless—it may even be good for you though the jury still seems to be out on that.
I believe other people who want to do simple home experiments related to pain tolerance often use ice water. You can either stick your hand in it or even immerse your whole body, if you like, and see how long you can endure it or train yourself to “accept” the pain or other mental techniques for pain tolerance. It’s easy to do, and as long as you don’t stay in long enough to give yourself hypothermia or frostbite, completely harmless—it may even be good for you though the jury still seems to be out on that.