Well...I er...this is a tough subject, since understanding girls and their needs is very akin to install Windows 10 blindfolded. We keep trying and trying, and sometimes we succeed. Girls tend to be very similar to each other, ye, but their cognizance may vary highly from person to person.
The "friendzone" is one of such subjects. As far as my experiences go, girls mostly friendzone guys, who they trust and like, but don't really admire. They accept their sympathy, opinions, help, but no really amatory stuff. They like them sometimes to be around them, but do not require their frequent or even constant presence. A typical turning-down phrase is "I think we could be (just) friends", or "you deserve a better girl than me". Familiar? If I had a dime for every such occassion, I could buy the whole EA from pocket, and apply you as a project manager
As I noticed most of the time, the friendzone is sort of a "prison", kind of a non-verbal prohibition of a romantic realitionship with those certain guys.
On the other hand, if a girl friendzones a guy, there is still a slight chance for a "friends with benefits" realitionship. It's pretty rare - less than 25% of friendzoned boys will get the opportunity for this - but it happens when it happens, and in these cases, sympathy and helpfulness can really pay off. I had three notable cases for this, once I gained the girl's trust. The first girl wanted to take sweet revenge on her boyfriend who cheated on her. The second girl was not particularly fond of romantic realitionships, he had little to no trust in boys, but we had several common interests (Red Alert 2 brought us together), and she probably desired to know whether or not am I good in something else than making good Red Alert 2 Yuri maps. The third and final one was a former classmate of mine at the University, and for some reason, she found me and my eccentric lifestyle attractive. And no, I wasn't looking for one-night stands, this was all their decision.
To sum it up, there
is a chance for friendzoned boys to...um...level up, but it's pretty improbable. And once said girl falls in love with someone else, you'll get demoted again.
To stay on-topic, the answer is: yes, you
can pick up girls solely with muscles, much like you can pick up girls if you look/behave like Justin Bieber. The problem is: these girls will be very shallow, they will love only your looks, and not the person who you really are. We Hungarians call them "surfacy", I know, this is not a proper English word, but still, a very clever way to describe such women. Usually, these are the girls who hang out with muscle-bound no-brainer idiots, who have nothing else of value.
Sorry for the slight derailing, unfortunately, these things connect with each other deep inside.