Why was yoga good, but boring?

Hello,

I took my first yoga class today and it was ok but I felt bored. I didn't feel like I was getting a good workout. I took hydroxycut before going to the gym expecting to take a different class but It wasn't until the next hr, so I did yoga and it was ok. Not a lot of people my age either. Matter of fact there was no people my age just older people.
Why was yoga good, but boring?
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