3. Do Compound Movements
Usually, when you enter the gym for the first time, you are drawn straight to complex exercise. You mostly isolate a single muscle instead of a muscle group that slows down the muscle growth. So, it is always better to use multiple muscle group exercises like squat, bench press, shoulder press and pull ups with a slow and controlled movement for fat loss and rapid muscle gain.
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If you are beginners, choose exercises that use at least half of your body. You should build up your endurance before you start to focus on one particular muscle set.