A year ago today I started the NHS Couch to 5K programme. Week 1 involved 60second runs which I struggled to do. A year on I'm now completing the Bridge to 10K, running for an hour and still amazed every time I lace up my trainers.
If you don't think you can do it I disagree ! It's an amazing programme. I recommend it and the support forum, the people on here are amazing too.