If you want bigger muscles, then endless bicep curls aren’t the way to go. See the guy in your gym that does nothing but curls? How big is he? Not very big, right? I see this all the time and wonder why people don’t change something that clearly hasn’t worked for years.
Think about how big your biceps are compared to the rest of your muscles. They’re kind of small aren’t they? Look at the muscles of your back on an anatomy chart. Huge, aren’t they? Look at the size of the quads and the hamstrings. Look at the gluteus. All those muscles groups are some of the biggest on your body and no one works them. No look at the pectorals, front delts, and biceps — the muscles everyone overworks. They’re so small it’s no wonder people have to get naked to tell they work out.
A properly done barbell squat works the whole back, gluteus, hamstrings, and quad muscles all at the same time. Working these large muscle groups grows all those muscles you don’t see in the mirror and this causes you to gain tons more muscle than you would by avoiding them. Working the large muscle groups through compound movements like the barbell squat and barbell deadlift will do much more for you than twelve different varieties of curls. Try is out and you’ll see what I mean.