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Although Erika Rischko set a new nine-minute plank record at the end of August, it wasn't a feat she'd set herself the goal of accomplishing. As it turns out, the 85-year-old fitness influencer from ...

Planks, deadbugs, bear holds they’re all great core exercises, but they also require a lot of lying on the floor – and that can get a little boring, week in week out. Sprinkling in some standing core ...