Have you ever ran and felt that your feet was sorely aching, or did you get an injury while running with it? If you answered yes to either of the two questions, then it's probably because your running shoes are already worn out. It's probably time to replace them with a new pair.
Running in worn-out or old shoes is one of the most common causes of injuries related to running. This is because running shoes, once worn out, already loses their capability to absorb shocks associated with fast running. It also lessens its cushioning abilities, allowing you to receive the full impact of running. If you continue to run in the same pair of shoes, this might contribute to stress and pain to your legs and joints.
How do you know that it is time to change your pair of running shoes? Better look at the midsole, which is where the shock absorption and cushioning features are centered. This is also the part of the shoe that first disintegrates. In general, runners should change their pairs of shoes after 300 to 400 miles of running, depending on the weight of the runner and the surface that you are running on. Of course if you are running on rugged terrain, you will have to change your pair earlier.
If you have a training log, it is advised that you mark the date when you buy your pair of running shoe. Also mark the date when you are expected to change them. As an aside, some experts recommend that you keep two pairs of running shoes that are used interchangeably, so that your other pair may be able to decompress itself in between workouts. This allows you to extend the life of your running shoes.
Of course, when you're already going to replace your pair of running shoes, better donate it to non-government organizations that accept them. They may still see some use for your old trusty pair of running shoes. At least your shoes will be still left in good hands.