He's saying he did the opposite; he tried to keep it flat. You should arch your back as well as curl your legs in and push them into the ground if you are going flat max bench. I keep it flat only for secondary chest exercises as they are more isolation and less weight.
Congrats on quitting. I keep falling back into drinking after a few months of cleanliness. I got some cognac to go with my cigars and drank the whole bottle in one night dammit.
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