5. Proper Equipment/Shoes
There is a reason that elite athletes wear shoes or use other athletic equipment that seems ridiculously expensive. These pieces of equipment are generally custom fit for their needs, which reduces risk of injury and optimizes athletic performance.
While you do not have to go spend $200 on a pair of running shoes, you should make sure that you are wearing properly fitting shoes and changing them at least two to three times per year. As a rule of thumb, avid runners should change their shoes every 300-500 miles, depending on the surface and impact of your running.
When you run in old shoes, you risk injury of shin splints, Achilles tendonitis, plantar fasciitis and knee/hip pain. This is because worn out shoes lack proper stability, absorption and cushioning for your feet and ankles.