Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to build muscle at home [title] Do push-ups to work your arms and chest. [step] Push-ups are the bread and butter of home workouts. Make sure your form is good to get the most out of it.

Ending1: Push yourself up higher than a bicycle or the edge of the wall. [title] Do hand presses on your top arm. Ending2: Start by raising your arms behind your head, then moving them all the way back behind your head. Do 30 to 60 push-ups in a row, then then count to four. Ending3: Your spine should be straight and in line with your butt, which isn't sagging. Your palms are generally a little wider than your shoulders, but you can go wider for a better chest workout and narrower for a better arm workout. Ending4: [substeps] To start, stand with your feet about shoulder-width apart and hold your arms in front of you with your palms facing forward. Raise your arms so that your chest is just about touching the tops of your palms.

Answer format: ending1/ending2/ending3/ending4