Upper Body Muscle Groups Explained: What Are You Really Working?

If you've ever done a workout and wondered, "What muscle am I actually working right now?" —you’re not alone. Understanding how your upper body muscles work is the first step to training smarter, preventing injury, and getting better results, whether your goal is strength, muscle growth, or general fitness. In this post, we'll break down the major upper body muscle groups, what they do, how to train them effectively, and common mistakes to avoid. 1. Chest (Pectorals) 🔹 Muscles: Pectoralis major – the big, fan-shaped muscle that gives your chest its shape Pectoralis minor – a smaller muscle underneath, helps with shoulder movement 🔹 Function: Pushing movements (horizontal or vertical), like pushing open a door or doing a push-up 🔹 Best Exercises: Bench press (barbell or dumbbell) Push-ups Chest flys Cable crossovers ❌ Common Mistake: Letting shoulders dominate the movement. Keep your shoulder blades retracted and focus on squeezing throug...