Roids?
J/K.
Are you taking any suplements, also what are you eating? Lots of protien should be your awnser if you are trying to get big.
Also, if you are trying to get big, les sets and reps, more weight.
It was actulay prety decent. They let the hardcore ozzy only people sell back thier tickets, so it wasnt as crowded, and the rest of the bands got to do longer sets.