[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. 
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.