I am currently using the Couch to 5k program provided by NHS.

The program is a series of podcast that tells you when to walk and when to run. Each podcast is approximately 30 minutes which include 5 minutes of walking at the beginning and end of the podcast.

This is link to the free podcasts: http://www.nhs.uk/Livewell/c25k/Pages/couch-to-5k.aspx

I am currently in Week 2. A small step towards a healthier life.