<human>:  What are the pros and cons of using a treadmill for exercise?
<bot>: 

Pros:
 Using a treadmill for exercise can provide you with a way to safely get regular cardiovascular exercise. You can also increase or decrease incline or speed to provide a greater challenge, and vary your workouts. Additionally, treadmills are accessible and provide an efficient workout, as they require little contact with germs and dirt outdoors. 2

Cons:
 Using a treadmill can be boring and lack the scenery of outdoor workouts. You may also find that the impact of the treadmill can be hard on your joints, leading to potential joint or neck pain. Additionally, treadmills can be fairly expensive, depending on the model.