support, flexibility, and stability for the activity that you're performing.
If you've been jogging in your walking shoes, you'll notice a big difference when switching. Running shoes are usually much lighter and more flexible, and I'll bet you'll find that you're able to lift your feet higher and go for a longer distance than with your clunky walking shoes. I wore new running shoes when I did my :33 walk/jog last night and was amazed at the difference. I felt like I was flying (ok, maybe just gliding), rather than simply dragging my feet along the pavement during the jog portions of my workout.
Wearing improper shoes is probably one of the biggest causes of jogging and running injuries. Since shoes are really the only equipment that's required to start your fitness journey by walking or jogging, don't take any shortcuts -- invest in a good pair. If you can only afford one pair of fitness shoes, splurge for the running shoes. Your joints and muscles will thank you.
~ Marie Anne