If you give it 100% that is great. You are giving it your all. But for you to improve you need to give it 110%. This is how I define 110%. When you are ready to quit and you continue to push yourself you are giving it 110%. When you have reached a certain level and you surpass it than you are giving it 110%. If you train yourself to your limit every day is that going to make you better? Doesn’t it make sense to push for the extra rep? You’re going to need a spotter because you are going to fail. But your failure is that extra 10% that is going to make you better.