What’s the difference between ‘lean’ and ‘bulk’ muscle — and which should you aim for?

There's a lot of talk about lean muscle compared to bulk muscle, but experts say it's not worth differentiating the two.
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Fast-Twitch Vs. Slow-Twitch Muscles—A Trainer Explains The Difference

What's the first thing that comes to mind when you think about the words twitch and muscle? Spasms, perhaps. You'd hardly be alone in thinking that. But when it comes to fitness, it's most commonly ...