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Gooo girlpower LOL
That would be my rule of thumb anyway.
I think that you can assume that you're not going to be very competitive, but also that searches for what you do aren't necessarily going to fit any one pattern...
You probably know the terms better than I do. I can imagine circus performer, circus aerialist, trapeze artist, high wire artist, circus entertainer, etc etc etc. Depends on who your target audience is and how precisely they're liable to search. I think you'll need to target your main terms precisely, but to include lots of variants and "peripheral" words on your pages.
I assume you know how to get to the top and stay there. ;)