Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do the boomerang in pilates [title] Sit down on the mat with your back straight, and legs extended out in front of your body. [title] Place your palms flat on the mat next to your outer thighs. [title] Cross your legs at your ankles and point your toes as you take in a deep breath.

Ending1: [step] Hold this breath for five seconds and then inhale and bring your body forward. [substeps] Keep your hips forward and lean forward on your right leg so your left knee touches your left thigh. Ending2: [title] Exhale and gently lie back so that you're lying flat on the mat. [title] Press your hands down into the floor, keeping the chest open. Ending3: [step] Try to hold your breath for several seconds, and then open your chest to breathe. Hold the breath for three seconds before releasing it and proceeding to breathe in deeply. Ending4: [title] Slowly lower your left leg across your left thigh. [title] Exhale and pull your right heel slowly towards your left thigh.

Answer format: ending1/ending2/ending3/ending4