Stuart McGill‘s book was the best means against back pain. I read the German translation (“rückenreparatur”) i think the English original is “back mechanic”.

He also describes how the spinal manipulation route often loses power if applied several times.

If it were useless we would see at least some populations in the world to have lost it altogether.

I am 38 and have so far had no cavity. Turns out adults have a very easy handle on dental hygiene, brushing your teeth, flossing and avoiding candy and sweet drinks

Use rated games to be matched with real players. After a few games that you will lose you will be matched with players against which you have roughly a 50:50 chance of winning / losing. Don’t focus on the ELO rating specifically at the start. Playing against humans is definitely different from the computer. In the lower ELO ranges you will see a lot of moves that don’t make sense and that the chess engine would never play. On the other hand opponents can be quite good at reading your strategy (as opposed to a dumbed-down engine).

Use the Analyse game function after the game to get an idea of the mistakes you made.

I would start with 10 minute games so that you can play a few games in a row (gives you more practice) but still have time to think.