Smartphones seem to have caused recent generations to hunch over much more than previous. If posture is a concern, make it a point to stretch every day. Stretching has been shown to help improve posture and strength. Just a few minutes a day will go a long way.
The most obvious benefit of stress is the increase in flexibility that you can gain through a healthy habit of stretching for 10 minutes a day. Taking a yoga class is a great way to stretch out your body and increase flexibility, as well.