A swim finished earlier than planned can still leave the day improved.

Partial versions count. Twenty minutes instead of an hour, four lengths instead of twenty, a walk that turned back at the corner: the benefit arrives in proportion, and the all-or-nothing rule is what keeps people at nothing. Stopping early is not failing the plan; it is doing some of it. Your body knows nothing about the number you had in mind.

This week, when the full version is unavailable, do the short one and count it. Decide in advance what the smallest acceptable amount is. Ending early beats not starting, on most days by a wide margin.