Loma means hair, and vi means against or contrary to. So Viloma means "against the grain" or "against the natural course of things". In Viloma Pranayama, inhalation is not a single continuous process, but it is interrupted by several pauses. For example, if the duration of an inhale to fill in the lungs is 15 seconds, then in Viloma Pranayama you have two-second pauses after each third second of a breath. As a result, the process of inhalation is extended to 25 seconds.
This practice will help you cheer up and set up for an active and productive day.
Note that holding up your breath on inhalation increases your blood pressure, whereas holding up your breath on exhalation, on the contrary, reduces it. Please keep that in mind when practicing.