Effort...

When students increase the amount of effort put into the swing, there is only marginal increase in distance but an exponential increase in error.

Students get a shock of their lives when they see the distance difference between their 70% and 100% swings. The average distance increase done across 34 students was a mere 6.7 yards.
Many students thought that a proportional increase in their perceived increase in effort did not garner an expected proportional increase in distance.

However, what they neglected was that this perceived increase in effort actually brought about an exponential increase in error or dispersion!

What this means for us is that we should just swing easy at 70% instead of 100% because the returns are too marginal.