提示词: 体育动作弓步的教学图，男人左腿向前方迈出一大步，同时膝关节弯曲成90°左右，大腿与地面平行；右腿伸直，上体与地面垂直，全身动作。
Prompt: Instructional image for a lunge exercise: a man steps forward with his left leg, bending the knee to about 90 degrees until the thigh is parallel to the ground. His right leg is extended straight back. His upper body is perpendicular to the floor, demonstrating the full-body motion of the exercise.
应用场景: 效率提升