Muscle is very important. I’m not talking about the kind of show muscles that bodybuilders carry around. I’m talking about, good, functional muscle that helps you lose weight and improve your daily life. If you didn’t know that every thing that we do in our daily lives requires some form of muscle activation, than I’d say you’ve been sleeping under a rock.
In order to build lean muscle mass, you need to train it at a high frequency. I personally prefer high frequency training as opposed to lower frequency training simply because lower frequency training requires more work than high frequency training.