The mountain climber is a dynamic plank variation that trains the core and hip flexors while driving your heart rate up for conditioning.
FormTwin gives you a living 3D twin of your anatomy. Tap any muscle to see how to train it, and watch the muscles you work light up as you log your sessions.
Get FormTwin — free on the App StoreMountain climbers mainly train the abs and hip flexors as you drive the knees in, while the shoulders and triceps hold the plank and the obliques resist rotation. Cross-body versions hit the obliques harder.
Both. The plank position makes them a core-endurance exercise, while the fast leg drive raises your heart rate, so they double as low-impact cardio.
You're holding a plank the whole time, so the front delts and triceps support your upper body isometrically. Keeping your hands under your shoulders and core braced spreads the load.
This guide is general fitness information, not medical advice. Muscle involvement varies with form, grip and individual anatomy. Consult a professional before starting a new program.