I practice Chinese herbalism and one of my areas of focus is in overcoming physical pain. I'm also a permaculture farmer and perform a lot of manual labor. One of the simplest, most effective, and easiest to use pain treatments is magnet therapy. What makes this such a great therapy for permaculturists is you get quick results, and all you have to do is tape a magnet on your area of pain, so the therapy doesn't get in the way of your outdoor tasks.
In Chinese medicine all pain is due to a fundamental stagnation of Qi and/or Blood. Magnets work by moving the energy, which breaks up stagnation and relieves pain.
For the most part, you want to use the highest strength therapeutic magnets, around 12,000 Guass. Place them on the main source(s) of the pain. Usually, the pain is radiating from a small point, find that point, put the magnet on and secure it with medical tape. Often there is 3-5 points like this that it is appropriate to put the magnets on. Leave them on as long as you would like.
Besides taping on individual magnets there are also body wraps and jewelry that contain magnets. All these are great, but I find that the strength of magnets in these products are much weaker than I prefer. I still use them because they are convenient and allow me to apply more magnets. If the pain is severe I will tape on magnets and use some of these wraps.
I have gotten incredible results with this therapy both with clients and on myself. When the proper strength magnets are placed in the right spots, 8/10 pain can easily be brought down to a 2/10 or even 0/10. This is a game changer for anyone struggling with chronic pain, especially when your livelihood depends on manual labor.