The Right Effort with a view to develop Mastery Over the Mind (sometimes translated as Concentration) is uplifting energy.
More particularly this is the effort to abaddon and prevent unwholesomeness arising effort must be applied to develop the wholesome qualities of Mindfulness on the 4 Frames of Mindfulness pertaining to Arising and Passing Away of Phenomena, equanimity and active calming the Fabrication - by claiming the breath to calm bodily fabrications, anchoring the mind to calm verbal fabrication and diluting perception and sensations to calm metal fabrications - thus increasing Concentration based on the arising and passing away of phenomena pertaining to the aggregates. If you are using something like a Ksina to develop concentration you should be looking at arising and passing nature of your mental perception of the image, otherwise just choosing the breath or sensation one a part of the body like the centre of the upper lip maybe more advisable. Also before coming to calming bodily, verbal and mental fabrication you have practice moral restraint to limit unwholesome bodily, verbal and mental action. Also your should actively direct your effort to abandon the 5 Hindrances by balancing Wisdom with Faith, Effort with Samadhi and the 7 Enlightenment Factors.
You have to check at regular intervals by reviewing whether your are applying effort to maintain equanimity and mindfulness hence not creating new fabrication from stimuli, actively calming the fabrications hence increasing concentration and one-pointedness on the 4 Frames of Mindfulness. If you do this too often then you get frustrated as you do not see progress and you are expecting to see some progress. Also to move to higher concentration you have to abandon applied effort to maintaining connectedness. If your effort is lax then your might will wander away mostly to unwholesome thoughts.
See:
- (Magga) Vibhaṅga Sutta(Magga) Vibhaṅga Sutta
- Cūla Vedalla SuttaCūla Vedalla Sutta
- Nimitta SuttaNimitta Sutta
- Samma,ditthi SuttaSamma,ditthi Sutta - Right View should define what you practice
- (Āhāra) Taṇhā Sutta(Āhāra) Taṇhā Sutta