Hey Mimi, that's impressive!
I don't do as much good varied stuff as you, though I do sometimes do a 3 mile brisk walk on days I can't bike. I usually bike 100 miles or more a week.

I remember your charity stair climb...how many flights was it again? It was unbelievable at any rate. ...But I've been climbing stairs too, starting this past week! I want to improve my biking uphill.
I thought about getting a Stairmaster, and of course ever-practical DH says "Well there's your stairmaster right there!" -pointing at the flight of stairs up to my office at home (13 steps). So I've been going up and down the stairs every day 20 or 30 times, either in one shot of 20 or two shots of 15. (not counting the 15 or so times i climb the stairs in my normal day.) If it gets easier I'll add more. I wear track shoes with 0" heels.