Hired Assasin

You get over to Atlas Gym and carry your MP-5 and face mask in a gym bag. The guy at the counter signs you up with a one day pass thinking of nothing to what's about to happen.

You walk into the locker room which is empty good for you and throw on your black ski mask and take out your MP-5.

You walk out of the locker room to the weightroom and there he is. Laying on a bench with a barbell. You rapidly walk over and let loose a blast of rounds straight into his chest.

People start running and screaming. You instantly run into the locker room in all the frenzy the locker room is still empty you throw the mask into your bag along with the gun and run out with all the rest of the crowd as you blend in and get back in your car and skid off.