Second weightlifting. Not really similar or left of field, but a good complement. I found it more interesting after I started following a routine and tracking progress on each exercise, trying to optimize nutrients before/after workout, daily macros etc. Optimizing these things is kind of satisfying.

For example, the other day I had to work out after work instead of in the morning, and I had also been encouraged to do some spinning because of a knee issue. I found that I didn't perform well but I don't what caused it exactly: the cardio before lifting, it being late, tiredness from work, eating schedule, the knee, etc. Kind of similar to debugging.