The case for measuring your workout the OG way—with your heart rate

You can level up your fitness factor without fancy trackers. All you need is your heart. Here's how to use heart rate training zones to hack your workouts.

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Photo: Getty Images/ sanjeri

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.