Why two 20-minute HIIT sessions per week is plenty

That HIIT workout routine is upping your cortisol (stress) levels. The head of research at Les Mills wants you to keep it under 40 minutes per week.

alt
Photo: <a href="http://www.stocksy.com" target="_blank" rel="noopener noreferrer">/W2 Photography

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.