The fittest Americans do 5 different workouts a week, because variety is the sporty spice of life

A new study answers the question: "How often should I change my workout?" And grab your tennis shoes, because the answer may surprise you.

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Photo: Getty Images/Westend61

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.