Running is a fast and rapid gait. In the slower walking gait, one foot always has contact with the ground. In contrast, running has an aerial phase. This phase consists of both feet coming up off the ground.
Initially, running was a natural phase of evolution. Today, running has become a popular sport. It’s convenient. It costs next to no money. And it’s a great way to stay in shape. From fun 5km races to more serious 40+ km races, there are all types of races and runners.