I get it when im not doing PH's too, I switch up my routine to back/bis same day and I can't get more than 3-4 sets on bi's because the pump is so hard I can't even curl my arms more than 1/2way up. I try to stretech them out and it is useless. It almost seems like this is impeeding my progress in my bi's. Any ideas on how to fix this or help it along?