fluorite, gym, game cg, 1girl, arms behind head, arms up, blue buruma, blush, buruma, exercising, female focus, gym uniform, hair bobbles, hair ornament, holding another's ankles, indoors, looking at viewer, on floor, one eye closed, open mouth, purple eyes, red hair, reflection, shirt, short hair, short sleeves, sit-up, sitting, socks, solo, sweat, twintails, vaulting horse, white shirt, white socks