Peggy Donato, an 80-year-old grandmother of 12 from Collegeville, Pennsylvania, just completed her 20th half marathon in Philadelphia this weekend. Peg first started walking half marathons when ...

This differed from the so-called 80/20 training approach reported ... runners was 40 years old, and the marathon finishing times ranged between two-and-a-half hours and six hours.

If you ask us, ‘Half marathon’ is a bit ... it’s clear that elite athletes train around 80% of the time at what we’d call low intensity, and just 20% of the time training hard,’ says ...