I know: My clients aren’t exactly begging to do mountain climbers — they are super tough! But they're hard for a reason. The exercise gives you a lot of bang for your buck, torching calories ...

Do you ever feel as though you are too time crunched to squeeze in an effective workout, yet you want good core balance?

Centers for Disease Control and Prevention. Adult activity: An overview. American Council on Exercise. Mountain climbers. American Council on Exercise. Burpee. American Council on Exercise.

Today we're going to do a High-Intensity Interval Training workout, or HIIT ... Get ready to get down on the floor for mountain climbers. Good, deep breath. Here we go. Again, you can start ...