A magnifying glass over a simple research chart
A start time becomes actionable when it carries an action with it. "When this moment happens, I do this first." Behavioral psychology calls this an implementation intention.
In a meta-analysis of 94 studies, implementation intentions showed a medium-to-large positive effect on goal achievement.
Gollwitzer & Sheeran, 2006
The useful point is narrower than "one sentence fixes everything." The research supports a specific mechanism: people do better when the moment and the first response are specified before the hard moment arrives.

Why it lowers start friction

Starting has friction because the task has to compete before it has any momentum. The first move is not automatic yet, while easier behaviors already are. If the task can be postponed, an undefined intention gives the start almost no chance.
A complete bridge with every section in place
The when-then plan changes the behavioral setup. The task may still feel boring or resistant, but the first move becomes easier to launch because the cue already points to the action.

The one-line structure

When [specific cue], I [first physical action]
The structure is simple. Both sides have to be concrete. The first part is a cue you can recognize in the real world. The second part is the first physical action you can actually do.
PRO TIP
A good cue is easy to notice. A good action is easy to do. The plan works when both parts are concrete enough to happen without another round of thinking.

Which one is real?

When I sit back at my desk after dinner, I open the project manual.
🔔 CueWhen I sit back at my desk after dinner
👣 First actionI open the project manual
Now check the structure: a real cue, a real first move. If either side is vague, the plan still leaves room to stall.
QUIZ
Which plan reduces start friction?
Option B has a real-world cue and one visible first action. Options A and C leave the start moment open: the cue is a mood or a vague time, and the action is still too broad.