Exercise more leg muscles. If it is a hobby, you should naturally run more. If you train professionally, you should strengthen your leg exercise. For example, you can go to the gym and exercise under the guidance of a professional coach. If the conditions are insufficient, you can do it on the playground.

For low-weight squats, you can take a 60 kg bar barbell for squat training, run a lap and squat for 12 times, then continue to run a lap without rest, squat for 12 times, and rest for three times for one minute each time. The rest is walking slowly and can't stop. Then continue, about three reincarnation. Remember, this is training. It should be added between normal running training.

You can also do squats.

Finally, add one point. Maybe your running posture is wrong. You should land with your toes and bounce with the upper side of your calf, not just your thigh.