Effort is described as the conscious exertion of physical or mental power. It is a serious attempt to achieve a particular goal.
What happens when somebody is so good at what they do that their work appears effortless? Say, a great dancer who is graceful, athletic and has astounding timing. Would you say the physical exertion it takes to dance well is an effort…even when the dancer makes it appear effortless?
Veterans of any industry usually do their jobs at such an efficient level the appearance of effortless can be misleading.