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.
Once you plug in the freezer afterwards, it immediately begins to run and cool. As with a brand new freezer, it will take several hours for the temperature to stabilize at 0 degrees Fahrenheit. Replacing frozen foods after the first 20 or 30 minutes will help lower the temperature more, similar to adding ice to a cooler. It may take anywhere from 4 to 12 hours to reach and stay the proper temperature, however.