What is the proper technique for performing a situp to avoid injury and maximize effectiveness?

To perform a situp properly and prevent injury while maximizing effectiveness, lie on your back with knees bent, feet flat on the floor, and hands behind your head. Engage your core muscles, exhale as you lift your upper body towards your knees, keeping your neck relaxed. Inhale as you lower back down slowly, maintaining control throughout the movement. Avoid pulling on your neck or using momentum to lift yourself up.