You will need an assistant for this exercise.
Kneel upright on the floor and ask your assistant to hold onto your heels for stability.
Keep your hips in line with your knees, maintain a neutral spine and engage your deep abdominal muscles throughout this exercise.
Slowly lean your upper body forwards towards the floor by opening up the angle at your knees.
Stop the movement when you begin to lose control.
Use the muscles in the back of your legs to assist you back to the start position.
Repeat.