Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do a glute bridge [title] Lie on your back. [step] Get into the starting position for the glute bridge by lying flat on the floor with your legs extended and your arms by your sides. It's a good idea to use an exercise or yoga mat for cushioning and stability.

Ending1: [substeps] All of your weight should be placed on your lower legs; you don't want to feel any strain in any leg or muscle in regards to elevation. Your arms should be comfortably placed between your legs. Ending2: [title] Place your hands on the floor in front of you and let your arms slowly fall down to the sides of your body. [step] Relax your wrists by laying down with your arms straight and your palms facing up. Ending3: [substeps] The mat should be available at any gym. To stretch on an exercise mat, lift or slide your legs towards you and press down on them with your heel on the floor. Ending4: [substeps] Bend your knees so that your feet are flat on the floor, about hip-width apart. Your entire spine should be resting against the floor in a neutral, un-arched position.

Answer format: ending1/ending2/ending3/ending4