My brother is 23 and started running June 2015. He has very little running experience (never ran at school or for a club) and built a good base through swimming. In the last 6 months he has run the following:
5km: 16.58
10km: 36:00
Marathon: 2.52 (last weekend)
He's running about 45 miles a week. I know he is no where near elite level but his times have surprised me.
Any similar stories out there? What could he run with more mileage and a coach?