Improving by just 1 percent isn’t notable (and sometimes it isn’t even noticeable). But it can be just as meaningful, especially in the long run. And from what I can tell, this pattern works the same way in reverse. (An aggregation of marginal losses, in other words.) If you find yourself stuck with bad habits or poor results, it’s usually not because something happened overnight. It’s the sum of many small choices — a 1 percent decline here and there — that eventually leads to a problem.
From “This Coach Improved Every Tiny Thing by 1 Percent and Here’s What Happened”
by James Clear