My calves are KILLING me!!

Yeah, remember how I've done 3 marathons, and like 6 half marathons, I really don't think my calves hurt as bad then as they do now.  I went to a step class at the gym, I was tripping all over myself, but I never biffed it, thank goodness.  Then when we did abs I found out that the instructor recently had a baby so afterward I asked her how old her baby is, her TWIN girls are 2 months old, wow, I'm impressed.....  I want to go soak in the hot tub, too bad they close early on Sunday, LAME!