Sometimes, people have life problems that can be entirely solved by doing one thing. (doing X made my life 0.1% better, PERMANENTLY!) These are not things like "This TAP made me exercise more frequently", but rather like "moving my scale into my doorway made me weigh myself more, causing me to exercise more frequently" - a one-shot solution that makes a reasonable amount of progress in solving a problem.
I've found that I've had a couple of life problems that I couldn't solve because I didn't know what the solution was, not because it was hard to solve - once I thought of the solution, implementation was not that difficult. I'm looking to collect various one-shot solutions to problems to expand my solution space, as well as potentially find solutions to problems that I didn't realize I had.
Please only put one problem-solution pair per answer.
I discovered a year ago something that substantially improves my mood and energy. In the shower each morning, I rub the sole of each foot for just a few seconds with a facecloth (or anything slightly rough would do). This produces a buzz (kinda endorphins + caffeine) that lasts all day, without wearing off as it is renewed by standing or walking. It hasn't diminished over time. It's an amazing free lunch. Not just making life 0.1% better, I'd genuinely say 30% better.
Perhaps I have particularly sensitive feet. But presumably this works for some other people, they just haven't tried it; after all, it took me decades to discover it.
I didn’t do it any more. I forgot about it next time I showered.