Slackin or Sacrificin?

I wonder if Lent sacrifices are retro-active. Say, I give up something during Lent even though I didn’t declare it on Ash Wednesday (Feb 21)? Say, if inadvertently I cut down on bike mileage drastically during what just so happens to be Lent season? And does it count that I also gave up working on my New Year’s resolution to eat fruit everyday during the exact same season? Would I need to prove that the time I spent off the bike and fasting fruit was spent doing God’s work? What exactly is God’s work?

Anyway, I skipped the Saturday ride this morning. At 8am I was reading. A book. On a Saturday morning. Ok, I wasn’t reading a Lent devotional or the Bible, but can’t this sacrifice count for something?