Mountain-Climber

1. Start in a plank position with arms and legs long, hands shoulder-width apart, shoulders stacked directly above your wrists, core engaged, and body in a straight line from head to heels.

2. As the starting position is established, lift your right foot off the ground and slowly raise your knee as close to your chest as you can.

3. Return to the starting position and repeat with the left leg.

4. Keep alternating the legs at a rapid pace, but maintain proper form and a tight core throughout the exercise.

5. Remember to breathe steadily and keep a neutral neck by gazing down at the floor just in front of you.

6. Depending on your workout, you can perform this exercise to a count (such as 20 repetitions per leg) or for a period of time (such as 30-60 seconds).

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