My workouts are organized such that on any day, the order of the exercises is also their importance. So if there’s ever a need to cut things short, I still do the same workout but I’ll cut it short somewhere in the middle.

If I know what I’m losing a whole workout somewhere, then there’s one of two things I can do. If my body is well recovered, then on the last workout before the break, I’ll bring the intensity way up with lots of myo-reps and drop sets and increase the number of sets. If I’m in need of recovery, then I don’t do anything special and just treat those days as a deload.

The question you should be asking is what you’re trying to achieve with each element of your workout and how important it is for you. For example, what do you get out of stair climbing that you don’t from running-walking or stretching? If there isn’t anything specific, it may well be that it doesn’t matter what you do as long as you do something. Consider also what your body might need recovery from. For example, does running hurt your joints? If so, then maybe use that opportunity to take a break from it.