In 2013 I started a new running approach, which really worked well for me.

I ran back from work once a week, as far as I could, along the route of the Central line (usually starting near Tower Hill). I struggled to get past 3 miles for a while, but tried to get one station further along the central line each week, then get the tube the rest of the way. Once I got past the 3 mile pain barrier I ramped up fairly quickly, making 4.5 miles to Queensway OTD 2013, and getting up to 7 miles (to Shepherds bush).

Unfortunately I got an injury so didn't manage to sustain this distance -- and have recently just been doing short runs but trying to push back up to 3 miles. #running