Running shoes have different design features from aerobic shoes, walking shoes and cross trainers. Generally, running shoes breakdown into three categories, motion control, stability and cushioning. Motion control footwear has features designed to keep the foot upright and stable. People who over-pronate, whose feet roll inward, should look for shoes offering motion control. Over-pronators often have flat feet.
Supinators usually have high arches.
If you pronate normally, you'll probably be steered toward a stability or cushioning shoe. Many have higher tops for greater ankle support. Cross training shoes are ideal for someone who runs a bit, walks a bit and occasionally takes a fitness class. If you've never been properly fitted for a sports shoe, consider making your next purchase at a specialty shoe store. Bring along the socks you normally wear for your workouts and the fitness shoes you currently use.