Mountain climber is a bodyweight exercise that serves as a strong full body workout, primarily increasing core stength and providing definition in the shoulders, chest, and upper back.

1. Start in a push-up position with your arms straight and hands shoulder-width apart.
2. Bring your right knee towards your chest.
3. Quickly switch, bringing your left knee towards your chest while extending your right leg back.
4. Continue alternating legs in a running motion.