I designed my simple workout-tracking spreadsheet way back in 2017 to help track triathlon training. I'd overtrained and given myself athletic-induced pnemonia that year, and in the aftermath, I realized that I'd done a ruinously bad job managing the three phases of triathlon training holistically.
I got exhausted, and then I got sick. That was stupid.
The problem is that I don't necessarily get sore when I switch sports a lot. So if I'm not careful, my total work load can sneak up on me from week to week. Most of the time when I get sick or injured, I can trace the cause to overwork the previous week or to stringing together too many heavy weeks in a row without a break. That was the case back in 2017, and it damn-near landed me in the hospital.