A chair is a multifunctional fitness device that can help exercise muscles throughout the body. The following are the detailed steps for using a fitness chair:1. Adjust seat height: Choose the appropriate seat height based on personal height to ensure stable placement of both feet on the ground when sitting down.2. Sit down: Sit on a fitness chair with your back against the back of the chair. Keep your body straight and relax your shoulders and neck.3. Step on the foot pedal: Place your foot flat on the pedal, shoulder width or slightly wider. Ensure stable contact between both feet and the foot pedal.4. Perform a half squat: Place your back against the back of the chair, keep your feet away from the starting position, then slowly squat down so that your thighs are parallel to the ground and keep your knees as close to the foot pedal as possible. Then, slowly stand up and return to the starting position.5. Perform sit ups: Place both feet on the foot pedals and lie on the seat with the upper body. Then, bend your knees and pull up your upper body, bringing your shoulders as close to the seat as possible, and slowly return to the lying position. This action can effectively exercise the abdominal and core muscles.6. Perform abdominal curling: Place your hands on both sides of your head, lift your upper body slightly, and then pull your shoulders as close to your knees as possible. Slowly return to the lying position. This movement can also effectively exercise the abdominal and core muscles.7. Perform back extension: Place your back on the seat, place your hands behind your head, and slowly tilt back to bend your back as much as possible.8. Perform upper limb exercises: Use the lever or tension rope on the fitness chair to exercise the upper limbs, such as arm support, pull-up, arm flexion and extension, to enhance upper limb muscle strength.When using a fitness chair, make sure to move correctly and avoid excessive force that may cause injury. And before using a fitness chair, it is best to seek guidance from a fitness coach to ensure safety and achieve optimal results.