Muscle question

[Guest guest]

I am not sure if this has been addressed before, but here's my

problem. I did an upper body workout on Monday and my triceps have

been KILLING ME. So, come Friday it is time for upper again and

guess what? I can barely pick up the weights. I was trying to do

triceps extensions and as soon as I got the weighs up my arms started

shaking like there was a tornado. I ended up not being able to

finish all sets, even though I repeated decreased the weights. It is

this normal? I got a good workout otherwise, but I really need

tricep work and wondering if I did something wrong.