On the worst days, shrink the plan instead of scrapping it. One page still keeps the chain alive.

All-or-nothing thinking turns a hard day into a missed day, and missed days are what actually break things. A reduced version preserves the pattern, which is the part doing the long-term work, and it costs almost nothing on a day when nothing is available. What you are protecting is not today’s output but tomorrow’s willingness to start.

Decide now what your smallest acceptable version looks like, before you need it. One page, one set, ten minutes. On a bad day, do that and let it count fully rather than treating it as a failure.