So for the first girl I would go up to the group and say "looks like the fun is over here!" then do the usual pick one of her friends turn your back to her..... classic mystery or ask all of them an opinion opener..... and get multiple views..... then single out her answer and say tell me more...... single out one of her friends ask them can I borrow you for a moment have her stand up and steal her seat...... tell her you stole it as you sit down and you are in......

The one in the gym just walk up to her and ask her opinon on the gym or give her the "girl if I was not gay you would so be mine!!" in under the radar in the gym is the best tactic...

most importantly just do anything to approach them even if you get burned you must get past this block. trust me you do not want this to be hanging over you....