@gspshields2 : you didnt do what I said exactly you just used the opener and continued the rest on your way :
I told you after you ask her , watch her response if she was friendly or not , if yes move on the next conversation ,
the wrong thing in this approach you was too eager to take her number , all what you tried to do is pickup , you also added "hey" , that lower your status , a real man just ask his question .
did she just answered the question politely or she was friendly because you looked like moved to next step ?
I said to her with a smile "Hey your hogging up the machine, I don't have all day" in a joking way.
here you are threatening her , she will feel pressure on herself even if you are smiling , women threat with smile a lot of time when they try to keep their image nice , so being smiling does not mean you wasn't serious for her
also it is very clear you are trying to pickup her in this line , that is wrong , you should have just have conversation , like "your weights are so light , are you sure that works for you"
also you asked her for her number very very quickly , you have to build comfort and if possible attraction before that .
it seem your words scared her BF , I bet you reduced her interest rate in her boyfriend because he didnt dare to do what he told you he is going to do "kick your ass" .
but dont try it again , because was you did was socially unacceptable , you have to not talk about pickup and taking phone number openly to poeple , that will reduce your value.
only ask for phone after you have a nice conversation that both of you find it interesting