I only skimmed through everyones message so if what I am about to say has been said already I apologize.
The reason the chakra is pounding so hard is two fold, it is an increase in the level of energy and a subsequent increase in awareness from the exercises and the frequency your consciousness is currently at. The pounding is a limiting factor in your projection, expect to experience this several times as your chakras becomes accustomed to the level of energy. Just enjoy it and of course stay relaxed knowing that it is not actually your physical heart and like all it will pass.
The reason the chakra is pounding so hard is two fold, it is an increase in the level of energy and a subsequent increase in awareness from the exercises and the frequency your consciousness is currently at. The pounding is a limiting factor in your projection, expect to experience this several times as your chakras becomes accustomed to the level of energy. Just enjoy it and of course stay relaxed knowing that it is not actually your physical heart and like all it will pass.