Where a training shoe helps with side-to-side movement, running shoes help with forward movement. Running shoes also provide more cushioning and support, which often translates into a higher heel drop. This makes for more comfort during long distance runs when you need lots of shock absorption.

Minimal cushion: Shoes with minimal amounts of cushioning at the midsoles are favored by runners who want to feel their connection to the ground beneath them. Runners who swear by minimalist shoes say they closely mimic a more natural gait while running.

It's generally accepted that the standard lifespan of road running shoes is somewhere between 300 - 500 miles, or around 500 - 800km, with lightweight shoes somewhere between 250 - 300 miles. So if you're running 20 miles per week, you'll probably need to replace your running shoes after around 4 - 6 months of wear.