Back
You should be working out your back just as hard as your front.
Strong back muscles will prevent you from slouching and will help with good posture.
Your back can also play a large role in boosting strength for other lifts you might not expect. The muscles in your upper and mid back help stabilize your shoulder joints and can help also with back pain.
Arms
Arm toning and strengthening exercises are important throughout life and the benefits go way beyond looking good in a tank top. Stronger arms make it easier to perform everyday tasks. Increased arm strength will increase results in any workouts. Muscle burns more calories than fat so strong, toned arms can help you achieve weight loss.
Legs
You might think having strong legs only relates to your lower body but compound exercises like squats, lunges, and deadlifts can actually work your upper body as well. Using barbells or dumbbells for added weight and intensity can work your shoulders, arms, and upper back. Adding leg exercises to your fitness routine doesn’t just work your legs, but can actually work your whole body! When performing a squat, you’re not just using your quads and hamstrings or glutes, your core and abdominal muscles are also doing hard work to keep your spine aligned and your upper body straight.