It can be a lot of fun to buy something new, but it can also be very frustrating. Buying a pair of running shoes is the same, and because of how our bodies work, I wouldn't recommend buying a pair of shoes quickly just because they are cheap or easy.
No two feet are exactly alike, but shoemakers have put shoes into three categories: Cushioning, Stability, and Motion Control. There can be a lot of difference within these three groups, but this is a good place to start.
Cushioning: Shoes that have a lot of cushioning have little to no side support. These shoes are good for runners with neutral feet who don't need this kind of support. Most of the time, a runner with a high arch will need this kind of shoe. If you are a pronator or an overpronator, this type of shoe may not be right for you.
Stability: Stability shoes are in the middle of the shoe range. They offer a good mix of cushioning and motion control. This shoe is for a runner who has a normal arch, lands on the outside of their foot, and rolls forward. If you don't know where to go next, this is a good place to start.
Motion Control: Motion control running shoes are for runners who need a lot of support. Extreme pronators and overpronators can benefit from a Motion control shoe, as can runners with weak ankles or other foot problems who could use a stable shoe.
Even though there are only three categories, as I said above, there is still a lot of room for change. This is just a quick list of things you should look for in running shoes. I would suggest going to a running store and having a worker look at your feet to get a good idea of which category they fall into. I would suggest going to a foot doctor if you have serious problems with your feet, like extreme pronation, fallen arches, etc. Running shoes might not be enough on their own. To get and stay on your feet, you might need orthotics or even just simple strengthening exercises.
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