The danger with internal power is that beginners often think they are using it, but are simply using external strength instead.
The ability to throw around body weight is no reflection of internal skill.

Internal power is real and tangible. It can be tested, explored and practiced.
But it has to be soft.

Most neigong are quite convoluted and esoteric.
They are like zen koan; becoming more fascinating as your understanding deepens and you are capable of seeing more.

Be patient. Be discerning. Watch your own practice carefully and address the means, the how.