Some days it’s just harder to run—here’s why that’s totally normal

It's just the truth that some days are harder to run than others. Here, experts explain what factors influence how easy a run could be on any given day.

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Photo: Getty Images/filadendron

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.