Raising her legs alternately, the woman is doing flutter kicks to strengthen her core and the muscles of her abdominal wall

flutter kicks lower abdominal wall pilates barre strength training extending legs 90degree angle targeted exercise spine motions midsection legs exercise mat muscular endurance resistance sets repitition yoga mat fitness knees arms woman sneakers shoulders upraised leg physical activity calorie burn training warm up aerobic exercise calisthenics drill stretching backbend stretch lower back belly flexibility core exercise workouts flexing lifting hip flexors lumbar piano indoor plant keyboard leg raising windows stairs