Get running :)
The BBC have a good article on how to get running – http://www.bbc.co.uk/sport/get-inspired/26777663
and then you can find a local running club or event here at Run Together https://runtogether.co.uk/
Personally I would highly recommend the Park Run series of 5K runs that take place all over the UK on a Saturday morning.
I can’t wait to get back to running once my glandular fever is cleared 🙂