Efficient Workout: This sit up machine is the perfect addition to your home gym. Which can help you perform sit-ups easily and strengthen your abs and stomach muscles with every exercise Adjustable Resistance: There are 3 resistance levels on each side of the ab workout equipment. Allow you to adjust the type of workout accurately. Press the armrest at the same time as you press the pin, the pin will be quickly switched to the next position. Very easy to adjust resistance. Whether you are a beginner or pro, you can quickly workout your abdomen and achieve the results you want