I am a doctor and want to give you a couple of tips! Prolonged cardio training is undoubtedly good for your health. But keep in mind that when walking and running, the joints get a huge load, which in the end can lead to negative consequences such as arthritis. Destroyed cartilage of the joints is often the cause of increased friction between the bones, which leads to pain during movement, so it is very important to choose best treadmill running shoes at gym-expert.com