Both physically and mentally. NHS says so. If you need a little encouragement and company, contact nikki@walkitoffni.com, UK & Ireland’s first accompanied walking project.
http://www.nhs.uk/Livewell/getting-started-guides/Pages/getting-started-walking.aspx
https://www.walkingforhealth.org.uk/sites/default/files/Walking%20works_summary_AW_Web.pdf