Exercise cannot tighten your loose skin, but you can minimize the amount of loose skin you have. If you have excess skin, patience is key as you wait for your skin to adjust to your new size.
A Pepsi takes between 30 and 45 minutes to freeze solid, depending on the temperature it was at before putting it in a typical home freezer. Be aware that most (but not all) Pepsi containers will burst if you keep them frozen for more than 2 hours.
You can get instant freezing soda if you shake it up real good, put it into the freezer for 3 hours and 15 minutes precisely, and you got an instant Coca Cola slushy or slurpee, or an instant freezing soda of any kind.