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If the two of you are vibing in person just invite her out. Or if you'd rather flake and invite her out over text, do that. I agree with Eddie. To this point you've pretty much set the frame as being workout buddies.
I agree with oceanx.
If you ask her out now, two things can happen. She either says yes or no.
To be sure that the answer is yes, i'd suggest you do the following as this will not be something that can be changed over night;
During your workout session with her you really need to
lead her. Don't ask her for her opinions on what to do and what she wants to do. Either she follows you or she doesn't. If you do this right, you will naturally build alot of attraction.
Additionally you want to tease her while working out. Establish yourself as a
FUN person to be with. Physical contact with her is also important. Not as in groping her while training, but be creative. Show her exercises where you get to stand right behind her and move her hips/arms/legs or whatever to "show her how to do it properly".
Good job on the text game as well. Don't be too available on the phone. I made this mistake with my ex-gf - hence the word "ex".
Good luck!