Originally Posted by dyldore
In my experience, poly breaks more from stretching than sawing, but whatever.
I was unaware that practicing volleys and rallying doubles put a lot of wear and tear on your strings.
But seriously, step off of your medium height e-coaching horse.
It's not about the wear and tear on your strings. Its the fact that polyester has terrible tension maintenance. If you use it because it takes 20+ hours for you to break the string, then you're using it for the wrong reason.