Build up your foundation slowly
Prevent injuries by building up your running training very calmly. Don't run 5 km right away in one go if you've never done this before. Even if your conditioning is very good and you play hockey, soccer or cycle 3 times a week, the load your body endures during running is much higher and makes your body more prone to injury. So start slow and gradually extend your distance and time.
Work on your running technique. If you observe top runners, they maintain short ground contact, midfoot landing and run upright. Follow classes if you really want to run more effectively. Everyone who take lessons think they can run right away without supervision.
Work on your core stability! It is important that you have a strong core as you have to absorb up to 3 times your body weight when landing while running. Especially your belly, back and glute muscles are very important here. Focus especially on your glutes as these act as your engines during running. They absorb the impact very well but also ensure that you can run more powerfully.