Vipassana Mediation is commonly called Mindful meditation. Vipassanā-meditation uses mindfulness of breathing, combined with the contemplation of impermanence, to gain insight into the true nature of this reality. All phenomena are investigated, and concluded to be painful and unsubstantial, without an immortal entity or self-view, and in its ever-changing and impermanent nature.
Mindfulness of breathing is described throughout the Sutta Pitaka. The Satipatthana Sutta describes it as going into the forest and sitting beneath a tree and then to simply watch the breath. If the breath is long, to notice that the breath is long, if the breath is short, to notice that the breath is short.
By observing the breath one becomes aware of the perpetual changes involved in breathing, and the arising and passing away of mindfulness. One can also be aware of and gain insight into impermanence through the observation of bodily sensations and their nature of arising and passing away.