The dorbarre lunge - alternating arm raise benefits your shoulders, glutes, and legs. This exercise promotes shoulder mobility and good posture. It also benefits movement and stability in the hips and knees. Learn more about properly executing this exercise with the video above.
Regression
Make this exercise easier by performing less repetitions, or not going as low into your squat position.
Progression
Make this movement more challenging by going lower into your squat position, or performing more repetitions.