Treadmill stretching may be because your body has not fully adapted to the stimulation brought by this kind of exercise. In order to alleviate this situation, the following measures can be taken:

1. Slowly increase the intensity of exercise. If you are just starting to use the treadmill, you may not adapt at first. You can gradually increase the intensity and time of exercise and slowly adapt your body.

2. Take a proper rest. If you feel numb when stretching, you can stop and have a rest, and then continue until your body adapts.

3. A reasonable diet. Before using the treadmill, you can properly supplement some vitamins and minerals to help your body better adapt to exercise.

4. Correct fitness posture. When using the treadmill, you should keep the correct posture to avoid the injury caused by body imbalance.

5. Pay attention to protect the knee joint. The exercise of the treadmill is challenging to the knee joint, so we should pay attention to protect the knee joint and avoid injury.

In short, if you want to exercise better on the treadmill, you should pay attention to your physical changes and adaptability, pay more attention to fitness posture and knee joint protection, and arrange training and rest time reasonably.