A 59-year-old who can hold a plank for 4.5 hours and do 1,575 push-ups shares 3 tips for getting fit at any age

DonnaJean Wilde

DonnaJean Wilde started planking in the early 2010s, when her children started doing it in random locations as part of a viral craze. At the time, her wrist was in a cast so she couldn't run and strength train as she normally would — but she could plank on her forearms.