@CalamityJane,
Oh, I wasn't clear -- 15/15/15 is sets of ball crunches. (That was my original "assignment" -- to do three sets of fifteen -- but at first that was too hard, so I started with 10/10/10, then 10/12/10, then 12/10/12, then 12/12/12, then 12/15/12, then 15/12/15, and now finally 15/15/15.... which at this point isn't that hard.)
I do the bike for 20 minutes, then weights for another 20 or so. Ball crunches take maybe 5 minutes total? Not sure.
Glad you're feeling better, keep taking it easy though, good idea...
Go Beth (1.5 hours, thud) and Thomas (1 hour 6 days a week, thud).