Which exercise is an example of a movement in the frontal plane?

The side raise is a prime example of a movement in the frontal plane because it involves raising the arms laterally away from the body. Movements in the frontal plane are characterized by actions that occur side-to-side and involve abduction (moving away from the midline) and adduction (moving towards the midline). In a side raise, the arms move laterally, directly reflecting this functionality.

In contrast, the forward lunge occurs primarily in the sagittal plane, characterized by forward and backward movements. Similarly, a pull-up involves vertical movement along the same sagittal plane by pulling the body upwards toward the bar. The plank is a static exercise focusing on stability and core strength, primarily engaging muscles in the frontal and transverse planes but not categorized as a dynamic movement within the frontal plane itself. Thus, the side raise clearly exemplifies the frontal plane movement through its lateral arm motion.