The muscles involved in shoulder abduction are the supraspinatus, deltoid, and the trapezius.

The best way to perform shoulder abduction is to begin by standing with your arms at your sides and your palms facing forward. Then, slowly raise your arms out to the sides until they are parallel to the floor. Hold this position for a few seconds before slowly returning your arms to your sides. Make sure to keep your elbows slightly bent throughout the exercise.

The number of sets and reps you should do for shoulder abduction depends on your fitness level and goals. Generally, if you are a beginner, start with 2-3 sets of 8-12 reps. If you are more advanced, you can increase the number of sets and reps to 4-5 sets of 12-15 reps.

The frequency of shoulder abduction exercises will depend on your individual goals and needs. Generally, it is recommended to perform shoulder abduction exercises 2-3 times per week, with at least 48 hours of rest between sessions.

1. Not engaging the core: Before beginning any shoulder abduction exercise, it is important to engage the core muscles to ensure proper form and prevent injury. 2. Allowing the shoulders to round forward: When doing shoulder abduction, it is important to keep the shoulders back and down to ensure proper form and prevent injury. 3. Not keeping the elbows straight: Keeping the elbows straight is important to ensure proper form and prevent injury. 4. Not using the full range of motion: When doing shoulder abduction, it is important to use the full range of motion to ensure proper form and maximize the benefits of the exercise. 5. Not controlling the speed: Controlling the speed of the movement is important to ensure proper form and prevent injury.