Want abs of STEEL? Planks are one of the best exercises for a flat stomach. Fact.
Plank with leg raise
Sets: (2 x 1 minute hold)
Begin on exercise mat, down on knees and forearms.
Gently straighten the knees until fully up on toes and forearms
Ensure the lower back is straight and core is engaged supporting the lower back region.
Lift one leg off the ground. Ensure core is engaged to provide support and avoid straining the lower back.
Hold for one to two minutes and repeat with other leg raised.
Exercise from Lila Hall.