I said I would post my understandings.......... Remember, my personal view is that the suttas describe them perfectly already, but some people insist on me using my own words, which could lead to misunderstanding of what I actually mean/they actually mean. Bearing that in mind.....
Right Effort :-
Prevent the unwholesome that has not yet arisen in oneself.
Let go of the unwholesome that has arisen in oneself.
Bring up the wholesome that has not yet arisen in oneself.
Maintain the wholesome that has arisen in oneself.
Right Mindfulness :-
After hearing the Dhamma the meditator sits in seclusion, he recollects that Dhamma & thinks it over
. ( the four frames of reference are just that, he would refer the dhamma to the foundations of mindfulness).
Right Investigation :-
Whilst dwelling mindfully the meditator examines that dhamma and makes a full investigation.
Is the four jhanas. The suttas describe them perfectly time and time again. They are states within which the mind and body reach more and more sublime levels of peace, from within which one can discriminate with wisdom.