Part 4 of our master's series.  We meet Donald  Flynn, a San Antonio-based runner who took up running to get out of going to gym class. He abandoned the sport for decades and picked it back up 5 years ago at the age of 60. He has finished three 100-milers and has his sights set on at least one more this year. He has some great stories to tell including when he "geezered" a young  guy.