There's a kind of indoor session I've spent years looking for a good game for.

Not the structured workout. The intervals on the calendar, the VO2 max set, the three-by-ten at threshold. TrainerRoad does that well, and I use it. When I'm in a training block, opening that app and doing the work the coach designed is its own discipline. The graph lights up, the watts are where the watts are supposed to be, and an hour later I'm tired in the specific way I intended to be tired.