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.
Minimalism saves me a lot of time and money.
Yoga relaxes me physically and mentally and eliminates my back problems.
Buying a light therapy lamp to place next to my computer screen in the morning improves my mood.
Getting outside every day, no matter what the weather is like, to breathe fresh air while walking has improved my mood.
This thread could help a lot of people who have replied to this post saying they are struggling with procrastination and distraction, which means they are fighting the wrong problem: https://twitter.com/reasonisfun/status/1047765669415211009.