Mindfulness is the foundation of all meditation training and practice. Imagine, relax, focus on something non objective neither person may be a tree, something peaceful or a quite place. At this stage it is important to watch the breath without controlling the breath. The breath is superior to other objects of meditation because you get such great feedback from watching the breath and circulation of energy in/out similar to torsion field structure. It is difficult to not control it while you are watching it. It takes a skill in neutral observation, relaxation and surrender which is turns in to effortless practice that is not trying to achieve anything at the end.. meditation is not a process not an objective.
Also Read: Mindfulness Meditation Practice