Often times a salesperson will be able to tell you which running shoes you should buy based on the wear and tear of your old shoes (think pronation and supination).
Two Running shoes are made for running shoes are made for running in, NOT aerobics, football, tennis etc. Three Use orthotics?
Below is a list of things to consider when buying a pair of running shoes.
Ask a salesperson to bring you the running shoes you want to try on in your size, or if you're unsure of your size, multiple sizes.
Err on the side of the shoe being roomy versus tight fitting, your foot expands as you run and tight running shoes can create havoc on your feet.