I love the basics... because they work!
With the use of effective cues and techniques the basics can give you more results than you ever thought possible.
Mountain climbers are used in every bootcamp and DVD you have ever seen. This is because they are a great bodyweight conditioning drill that hit the core and upper body with little to no equipment.
The problem with mountain climbers is the fact that most peoples' asses are bouncing up in the air, hips are swaying and the exercise becomes a shoulder blaster more than anything else.
Here are 2 easy ways Stacey Schaedler Strength has changed up the mountain climber to give you more bang for your buck. Progression 2 promises to make your core nice and sore tomorrow ;)
(Note: wrists and shoulders in a line. Contract straight leg glute to extend the hip as you flex opposite knee into chest. Perform one side for 15 reps and then 15 on the other side.)
Give these a shot and let me know how it goes!