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.
Science Daily

This type of meat supercharges muscle growth after workouts

Scientists discovered that lean pork builds muscle more effectively post-workout than high-fat pork, even with identical protein levels. Using advanced tracking techniques, they found that fat content ...