T here is nothing new about planks. It is arguably one of the most tested and tried moves, in circulation, even before it became cool and social-media approved, to hit the gym. Planks, for the ...

DonnaJean Wilde can plank for 4.5 hours. She built up to this over a decade, while juggling parenting, teaching, and studying for a master's degree. She started planking with her children as part ...