Try This Arm Workout For Beginners, Designed by a Personal Trainer

Strengthen the muscles on the backs of your arms with this effective triceps move. If it's too difficult with two dumbbells, try holding one dumbbell with both hands.

• Grab a set of dumbbells, and lie face up on a mat with your knees bent and feet flat on the floor.
• With one dumbbell in each hand, raise your arms so they're above your chest, palms facing in, making sure your elbows are straight but not locked. This is the starting position.
• Slowly bend both arms, lowering the dumbbells by your ears so your elbows are bent at 90 degrees.
• Straighten your arms, coming back to the starting position. That's one rep.
• Do 10 reps.