I am setting up a training plan with the goal to be able to complete a metric century by a certain date. Looking at the calendar, I know there are several dates when I will have no access to a bike, or times when I will simply find the stationary bike unappealing (and outdoor riding is not possible). Does anyone have a recommended method for estimating appropriate substitute workouts? Running and walking are always viable options for me (you can do those anywhere), and I prefer a rowing machine when I’m weary of the bike (and stuck inside).
Apologies if this is a duplicate topic - I searched but could not find an exact match.
I’m sorely out of shape, but familiar enough with training metrics.