When you smile or laugh, you use your ______________., face muscles, Heavy backpacks can hurt your back and your ______________ muscles., dorsal, Boxers have very strong shoulders because they train the ______________ muscle., deltoid, When you flex your arm to show your power, you look at your ______________., biceps, Push-ups are great exercises to make your chest and ______________ muscles strong., pectoral, To extend or straighten your arm, you need to use your ______________., triceps, Doing planks helps you get a strong stomach and hard ______________ muscles., abdominal, When you sit down, you use the ______________, which is the muscle in your bottom., gluteus, Football players need strong front thighs, so they train their ______________., quadriceps, The ______________ is the big muscle on the back of your lower leg (calf)., gastrocnemius, The ______________ is located on the back of your thigh, just below the gluteus., biceps femoris

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