How can you tell if you're doing a 100% contraction?
most isometric newbies may not be able to fully contract the muscle, how can you tell if you are?
I often find when i do iso's that i can contract the muscle very hard at first for about half a second and then the contraction becomes weaker, even though im trying my hardest.
its a weird feeling as i can tell that it is not my maximum strength but its almost like my bicep (for example) is literally unable to squeeze out maximum force
any explanations or ways round this?