Lie on your back with your legs bent and feet flat on the floor.
Keep your legs at hips-width apart, and tighten your abdominal muscles.
Maintaining a strong back, lift both legs up to the table-top position, with your hips and knees at 90 degrees.
Control the movement as you lower the legs back down, keeping a stable spine.
Repeat this movement, ensuring your back does not arch off the floor.