This is the formula for your happiest workout yet

A professor from Fukuoka University in Japanrun wants you to calculate your run pace using the "smile" formula. Here's how to find your ideal speed now.

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Photo: Getty Images/Blends Images and Erik Isakson

16 Upper Glutes Exercises Personal Trainers Swear By for a Stronger Butt

Why your upper glutes deserve more love, and the best exercises to strengthen them.

woman doing an upper glutes exercise with an exercise band.