背部着地，两膝弯曲，足平放于地面。
Lie on your back with your knees bent and feet flat on the floor.
身体仰卧于地面，双膝弯曲，双足平放于地面上。
Lie on the floor with both knees bent and feet flat on the floor.
人体卧于瑞士健身球上，两膝弯曲，足平放于地面。
Lie on a Swiss ball with your knees bent and feet flat on the floor.
找一个舒适的椅子或板凳，直背而坐，双脚平放于地面。
Find a comfortable chair or bench and sit with your back straight and your feet flat on the floor.
坐姿后背伸直，手放于身体两侧的地面上。
坐姿后背伸直，手放于身体两侧的地面上。
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