greetings,

can anyone elaborate on the reason my body has maasive vibration ( especially in arms and hands) when meditating with chant or not. I know it now so I’m not afraid of it but why does this happen??. First time was from ims treatment in spine for a sore lower back 9 yrs ago. No meditation at that time. That was freaky. Second time just recently during group meditation and it  a was huge release emotionally. I was scared. Third time I just let it roll. Stopped breathwork and waited for it to subside. It was pleasant and no tears or jerking in my body this time. 

howdy,
that you are just now noticing vibrations has more, I suspect, to do with your deepening awareness than with a new phenomena. from a wider perspective one could say that 'everything is vibration' or that 'there is phenomena and the knowing of it'.

almost everyone who practices comes to a point where observation of vibration in their bodies becomes apparent and it is often interesting or scary or excellent, depending on our conditioning.

i remember feeling 'chakras' for the forst time in India.  until that point i had believed them to be new age mumbo jumbo. but THEY WERE REAL!  well...at least they were experienced ;-)

investigate them closely...and everything else
cheers