Recumbent position? ?

The recumbent position is a lying down position where the person is lying on their back with their legs slightly elevated and supported. This position is often used in medical settings for patients who are unable to sit or stand, as it can help reduce pressure on the spine and promote circulation. It is also commonly used in exercise equipment such as recumbent bikes and recumbent exercise machines.

A reclining or lying down position in which the body is supported from behind, as in a chair or bed.