Lying on your back with your hips and knees bent at 90 degrees, make sure your back is flat on the ground.

Lift your arms straight up.

Bring both legs down whilst keeping your knees at 90 degrees.

Touch the ground with the tip of your toes.

Come back to starting position.

Avoid lifting your head and curve your back.

Will help:

General Fitness

Lower back back

Hip flexor muscles weakness