I have been doing 5 k on the treadmill for a year now. In the last month I gave up drinking and started to do 5k then walk for five minutes then do another 1-2k. My boss said to me on Tuesday "you could do 10k you know if you can do 5, because the challenge will be mental not physical" I dismissed it as madness. By yesterday the thought had taken hold so I got on the treadmill and just went for it. I did 10k for the first time in my life (at 46 years old and never ran until last year) I did it in 59:42. To say I am chuffed is an understatement!