Author, fitness model, and trainer Kirk Charles, NASM-CPT CES, knows
Read moreHow Men Over 40 Can Make Planks More Challenging
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Try These Planks for More Ways to Work Your Core
Sometimes, the best things you can do are the basics.
Read moreGet One Step Closer To Rock-Solid Abs By Doing Bear Planks
Spoiler alert: There is no fast track to a six
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