in case this is not obvious to all, when Anna says "trainers", read "sneakers". Otherwise, this makes for pretty entertaining reading!!!
Anna:
in Feb I threw away my Nike trainers because I was getting pain in the bottom of the foot, like someone taking a knife to it. I went to a great store and tried on some Reebok and Ryka trainers for studio aerobics and could not believe, in comparison, that I had been using my old Nikes for so long. I mean, the comfort level just wasn't there any more, like working out with concrete blocks at the end of my legs. But until I tried a new pair on, I didn't realize my sneaks were past their sell by as it were.
They say that depending on how much you use a running shoe, they need replacing every three to six months. The cushioning breaks down after a while and no longer protects you like it once did. Mind you, the cushioning can also break down if the shoes are retired for a while due to other things happening in your life. I believe this rule applies equally to an aerobic shoe. However, budget restraints might factor in here.
What should you look for? I'm no expert. I tried them on looking for superior cushioning for hi impact activities, great arch support (though you can always supplement this with liners), hi tops if you have a tendency to weaker ankles (I can fall over just walking along a hiking trail in a straight line, no incline...). You may want to check out sites like "runnersworld.com" because feet are very different, hi arches, lo arches, over-pronation, etc, and what you really need is to find a specialist whio will look at your old trainers and see the wear patterns, watch you walk, look at your street shoes for the wear patterns and help you to find out if you have any foot structural or functional weirdnesss (I have sinking arches I am convinced...) that needs correcting with a particular shoe.
Try to go to a really good shop that will not think you are a total berk if you try on a few pairs and then hop about the store doing some fab Cathe moves, just to see how they feel. I did this in my local store, no-one looked askance and I came away with a great pair of Rykas. Cost a lot, but I seriously do not want injuries thank you!
There's a magazine out here in US called "backpacker" that ran an article this year or last on how to fit a great pair of hikers. They may have it posted online at their website, or links to find such info. The theory is pretty much the same. Except there you prance around the store with a 40 pound back pack on trying out some neat moves to see how they feel. Least, that's what I did....!
Hope some of this helps
Clare