Use these 20 equipment-free arm exercises without weights to get a great arm workout at home, or anywhere you want. lie facedown on a mat with your arms at shoulder height and elbows bent to. 5. straighten your arms while pressing your torso up and away from the floor, then return to the start position. arm workout with dumbbells at home. these weighted movements will work your entire arm, with specific exercises focusing on the biceps, triceps, and shoulders. repeat the following sequence of exercises 3 to 4 times.. Lateral raises are a great isolation exercise for arm and shoulder workouts. by focusing on primary using your deltoid muscles your shoulders muscles will “popping” out in no time! grab two light dumbbells and hold each by your side. lock your elbows and raise the weights together until horizontal, then slowly lower them back down..