I did a plank every day for a month and here's what happened to my running

Working the abs, glutes, obliques, back muscles, hips and everything else needed for a strong running core, here
Working the abs, glutes, obliques, back muscles, hips and everything else needed for a strong running core, here's what happened when John did one everyday for a month.

I did a plank every day for a month – and these were the results

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I did a plank every day for a month and here's what happened to my running

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