Exerc. Class 55:00 
In Chatham. Started with steps out and used pretty peppy music. Knees didn't bother me as they sometimes do on the step--yay! Skipped side planks as usual.
Fellow-exerciser who turned 80 last week said that her family had a party for her with about 40 guests--nice. And the exercise instructor brought fruit and chocolate-dipped strawberries.