but like some guys says, drop the weight and up the reps then you burn, also do a drop set, like say I drop from my last set doing 100KG down to say 40-55kg and try do 15 without lockout, at around 8 you are effed, it feels like 10000000000kg
I also do this from time to time to keep things different, damn everytime I do this and drop from a substantial weight to something like 40kg the wife walks in and giggles at me struggling with such little weight, but that doesn't look very heavy......why you struggling so much.