I heard this presented as a photography class. Doing a quick search shows that it's from a memory plot in "Atomic Habits" by James Clear.

The story features Jerry Uelsmann and having his class of photographers either work by quantity or quality of shots.

The specific example I remember was "you can only take 1 shot" vs "take as many as you can"; and the lesson being /the group that did many reps had ultimately better photos/.