6 Arm Workouts Without Weights for Guys
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Without forearms for now, the main muscles of the arm are the biceps and triceps.

These are the muscles we are going to train with focus to improve their strength and look.

To force the muscles to grow (which is what gives them shape and definition/makes them look ‘toned’) you need to overload them with exercises that you can ideally perform for sets of 6-12 reps.

Source: travelstrong.net