Please choose the correct ending to complete the given sentence: Uncategorized: [header] How to do mountain climbers [title] Get into plank position. [step] Get down on the floor on your hands and knees. Extend your legs out behind you, balancing on the balls and toes.

Ending1: [substeps] Your arms should be out in front of you. For the push-ups, push your legs back and straight, while keeping your hips lifted and slightly bent. Ending2: Place your hands to the sides of your feet in front of you. [substeps] Once you're on all fours, make a " horse-eye " roll. Ending3: Place your hands directly under your shoulders with your fingers facing forward and slightly outward. Keep your core engaged by squeezing your stomach muscles. Ending4: If your palms are flat against the floor, your palms should face up. You may want to repeat this with your other hand in front of you and your heel at the same time.

Answer format: ending1/ending2/ending3/ending4