Exercising with Baby

I was doing yoga today and Chris came in with Sam.  Sam took one look at me and burst out laughing, it was actually loud baby giggles.  It wasn't the first time.   Last week when I was doing Pilates, he crawled in and it was the same reaction.  Chris claims it's because Sam is "not used to seeing his mom move her body in that way."  I'm hoping that's the case ; )