So I started Zumba last week with SIL and really enjoyed it. This week SIL was hung over so couldn't make the class, but my MIL came with me instead??? She insisted. Anyway my MIL is a M&S/John Lewis loving 64 yo lady.
She turns up and it was quite literally the funniest thing I've ever seen. Arms and legs everywhere. Deffinately worked harder laughing than zumbaing!! I feel quite tight because I think she thought she was doing me a favour coming....and then she was a little embarrassed by all the ass shaking, thrusting and gyrating.
I mentioned it to DH when I got back and he said I had been cruel to laugh....but I couldn't stop myself. And I'm still laughing now inside....!! 
Would you laugh if your MIL was Zumba-ing a few feet away from you??