Climbing a mountain is no easy feat, but what if that mountain is actually the floor? That's the concept of this week's exercise which asks the question: What happens when you get on the floor and run your knees in and out as fast as you can? The obvious follow up to that is to wonder why someone would want to do this and the answer to that is: Because you can (although, if you really can't, I have some variations below).
Mountain climbers are an excellent move for building cardio endurance while also building core strength and agility. This is also a great move when you don't have much (or any) equipment and want a challenging way to work your body.
There are a couple of ways to do this move. One, is to run the knees in and out without touching your toes to the floor. Another is to do the opposite and touch your toes to the floor, making it more of a foot-switch than a run. If this move doesn't agree with you, you can take it slow and simply walk one foot forward into a low lunge, walk it back and switch legs. I also have a gliding disc version that might work for people who need less impact.
Work this into your usual cardio routine or add it to other cardio exercises to make your own high intensity circuit workout.
Do it right: Begin in a pushup position on the hands and toes. Bring the right knee in towards the chest, resting the foot on the floor. Jump up and switch feet in the air, bringing the left foot in and the right foot back. You can also run the knees in and out rather than touching the toes to the floor. Continue alternating the feet as fast as you safely can for 30-60 seconds.