Re: gym
Just as an update, there's a new option for Meditation that allows any character to convert their unused actions directly into toxicity. I'm trying to see if there's a pattern to number of acitons spent --> amount of tox, but it looks like it's (VERY roughly) about a 2-1 ratio. For every action you spend meditating, you can get ROUGHLY two toxicity. If you do multiple actions at once, you may get slightly more than 2 per action, or sligtly less than 2.
If your PC is very close to the next level, this is a good way to get there quickly.