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 ...

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 ...