If you lift weights the same total amount each week, it doesn’t really matter whether you do it in one big session or spread it out over several days—your muscles will grow about the same either way.

If you lift the same total amount of weight each week, it doesn’t matter whether you spread it out over one day or three+ days—you’ll still gain about the same amount of muscle, no matter if you’re experienced or if you’re training your arms or legs.

If you're a young guy lifting weights more often each week, you'll likely get stronger faster—but that doesn't mean your muscles will get noticeably bigger.

Doing your workouts more often per week doesn’t seem to help you build more muscle, as long as the total amount of lifting stays the same.

If you lift weights more often each week—like 3 or more days instead of just once—you might see a little more muscle growth, but only if you’re not doing the same total amount of lifting in both cases.

If you lift weights the same total amount each week, it probably doesn’t matter much whether you do it in 2 big sessions or 5 small ones—your muscles will grow about the same either way.