Extensor Action on a Scale

[Par71]

If you had to rate the amount of force you use to apply extensor action on a scale from 1 to 5 what would it be - for Swinging? And for Hitting?

Let's define "1" as the minimum force required for the right arm to pull the left arm into a straight line. And "5" as the maximum force possible for the right arm to straighten against the checkrein of the left arm (as in isometrics).