Meditation, for me, is getting into a flow state doing just about anything I want to do. Sometimes I spend hours sim-racing, woodworking, or coding and after being in flow for those several hours, I feel exhausted from the mental and physical exertion, but I am also calm the rest of the day into the evening. It only works if I get into the flow state, but if I just sit there and fuck things up badly and never flow, then it's not useful. Other examples of activities I get into a flow state for, and work similarly to my hobbies, are cleaning, cooking, playing video games, reading, and rarely TV or movies. The more manual the better, I find. Woodworking is the best, especially working with dangerous machines, because I find you absolutely HAVE to focus and flow in order to use something like a table saw properly.