Thanks for the suggestions, Rosabella -- I'm afraid ballet isn't in the cards
(though I definitely did my time hauling around carloads of little girls with their hair up in buns, long ago
). When you say "stadium steps" do you really mean "steps" or are you actually running on the bleachers themselves? In large stadiums, as I recall, the steps are all pretty standard, but the seats rise higher as one gets farther up in the stadium, yes?
Thanks for the reference, TOT! They all seemed to give similar advice on that forum: strengthen the quads (and hamstrings, but that's not a problem for me), cycle, and use poles when going downhill. Will do all of that; thanks again!