"На спине" is a Russian phrase that translates to "on the back" in English. It can refer to a physical position, such as lying down or resting on one's back. This position is often associated with relaxation or sleep, allowing the body to rest evenly. In various contexts, "на спине" can also describe activities like carrying something on the back, such as a backpack or a child. This phrase is commonly used in everyday conversations, sports, and physical activities, emphasizing the importance of back support and posture.