Mountain Climbers
Fast alternating knee drives from a push-up position — abs, hip flexors and cardio in one.
Execution
- High plank like a push-up start, hands under the shoulders, body in a straight line.
- Pull one knee to the chest, then return it as the other drives forward.
- Tempo is your choice — fast for cardio, slow for more abdominal tension.
- Hips stay low — no piking up or rocking side to side.
Tips
- Count "left + right = 1 rep" so logs stay consistent.
- Variant: cross-body (knee to the opposite elbow) hits the obliques more.
Two exercises in one
Mountain climbers are a hybrid: underneath, a plank position the trunk has to stabilize against gravity; on top, a fast knee drive that pushes the heart rate up. That makes them both core work and a conditioning stimulus — and exactly why they're hard to perform cleanly, since speed undermines stability.
Execution
The starting position is a high plank: hands under the shoulders, body in a straight line. One knee drives toward the chest, then returns, then the other. The shoulders stay over the hands, and the hips stay level — they should neither pop up nor sag.
If you're doing this as a timed interval, pick a tempo that keeps the hips still. Slow and stable is far more valuable here than fast and shaky.
Common mistakes
- Hips rise up. The most common mistake at high tempo — the exercise turns into hopping and the core checks out.
- Hands creep forward. Puts unnecessary strain on the wrists. They belong under the shoulders.
- Setting the foot down. The knee drives forward and the foot never touches the ground — otherwise it becomes a lunge.
Programming
As a conditioning element in intervals: three to five rounds of 20 to 40 seconds with an equal rest. As a core exercise: slow, controlled reps with a brief hold at the top of each knee drive.