so, i've never taken a yoga class in my life, but i've been meditating and doing energy work for 10-15 years. yesterday i went to my first hatha yoga class. i found it to be more physically strenuous than i thought it would be, but i was ok with that....what i found to be interesting, is doing the most basic of poses, breathing exercises etc, i was having massive energy sensations...it wasn't a specific center, or anything localized. I was having intense waves of energy flow through my body, head to toe aswell as the reverse. this is the kind of thing i had only hoped for once i had become well versed and practiced in yoga, but it would seem even one class had this kind of result. is this normal, or is it just from having extensive practice in meditation and energy work through out my life?

P.s. i went to the class with my g/f, she found it to be relaxing and benificial, but didn't have an experience similar to mine.