[okie]

Is this an equal opposite deal? So, the left is resisting the upward pull of the right? Does that not introduce unwanted muscular tension in the left arm?

I may have missed the ferry on what you are float loading out there. The beauty of extensor action is the "extension without muscular tension in the left arm" Structure sans the rupture!

Set me straight! Sorry, I tend to be punny in the morning (large doses of caffeine doing their thang!)