The rear double biceps is a popular bodybuilding pose that showcases the muscle definition and size of the back and arms. The pose involves flexing the biceps while turning the back to show the muscles' size and depth. While there are no direct synonyms for the term 'rear double biceps,' it is often referred to as the rear bi pose, back double biceps, rear lat spread, or back lat spread. These terms are commonly used in bodybuilding circles and provide an easy to understand description of the pose. They serve as useful tools for fitness enthusiasts looking to learn more about different bodybuilding poses.