1
Lie flat on your back on a mat or floor with one arm extended to the side for balance and support, legs together and body in a neutral supine position
2
Engage your core and prepare to lift your legs by bracing your abdominal muscles, keeping your lower back pressed toward the floor throughout the movement
3
Slowly lower both legs toward the floor in a controlled manner, maintaining a straight line from hips to ankles, descending as far as possible while keeping lower back contact with the floor
4
Powerfully drive both legs upward using abdominal contraction, returning legs to the vertical or near-vertical starting position, maintaining strict control throughout the concentric phase