Eric Roberts says the burning sensation in muscles doesn't come from lactic acid and isn't necessary for growth. Muscle development requires progressive overload: lifting heavy weight with good form, close to failure. Skip the light weights chased for the burn.
Should you be doing lightweight and feeling the burn, or should you be doing heavy weight and not feel the burn? That burning feeling comes from lactic acid buildup. Lactic acid buildup is just a byproduct of your muscles using carbs for energy. It's a common myth this is what builds muscle. What builds muscle is getting stronger, lifting heavy weight, and pushing yourself close to failure. So when you want to build muscle, it's the most effective to lift the heaviest you can as long as you can maintain proper form, regardless if feel the burn or not.
