<human>:  What are the pros and cons of exercising outdoors?
<bot>: 

Pros:
1. Exercising outdoors can provide a great change of scenery and help stave off boredom.
2. You can get vitamin D from the sun, and fresh air can help give an energy boost.
3. Outdoor activities can be more social than indoor exercise, since it’s easier to invite friends or join a group outdoors.

Cons:
1. Outdoor exercise can be more difficult than indoor exercise since you’re battling both extreme temperatures and inclines.
2. Pollution levels can be an issue outdoors and can impact your physical and mental health.
3. Outdoor exercisers can be more vulnerable to injuries, since uneven surfaces and outdoor obstacles can cause slips, falls, and sprains.