Outdoor exercise better than indoor for postmenopausal women (no mention of vitamin D)
Older Women Who Exercise Outdoors More Likely to Stick with It Scientific American
3 month trial – 3 days per week of 1 hour postmenopausal women
Outdoor exercise 97% continued
Indoor exercise 91% continued
From Adherence to exercise and affective responses: comparison between outdoor and indoor training. Menopause Nov 2014
For only the outdoor group
Decreased Depression symptoms
Increased physical activity level
See also VitaminDWiki
Walking an hour a day (more vitamin D) decreased chance of breast cancer by 14 percent – Oct 2013
60 minutes of sunlight needed to decrease vitamin D deficiency in sunny climate – Dec 2012
Vitamin D protects DNA against UV skin damage – 5 studies 2012-2013
New Zealand doctors are starting to prescribe more sunshine – Aug 2012
Prescription: A walk in the park to improve your health (ParkRX) - May 2014