Activity is easy to see and easy to feel good about. Results are what actually changed. A week can be full of the first and empty of the second.
Activity thinking asks what did I do. Results thinking asks what is different now. They diverge constantly: a day of meetings, emails and calls can produce no change in anything that matters.
The shift is to define the result before the activity, in terms somebody else could verify. Not 'work on marketing' but 'the new page is live and three people have enquired through it'.
The test for any planned activity: if I do this and nothing changes, would I be able to tell? If not, you are measuring effort.
In owner-managed businesses, because nobody is checking. An employee has a manager who eventually asks what came of it. An owner can be busy for years.