Is it okay to drink beer then working out ?

But why would you?: Seriously, if your goal is weight reduction, beer is very high in empty, non-nutritive calories. You can't spot reduce, so aiming for specific reduction in abdominal circumference may prove frustrating. Abdominal exercise will certainly tone your 6-pack which you can show off nicely once total weight reduction is achieved. There is no substitute for healthy eating & exercise to reach your goal.