Beat Unit
A beat unit is the rhythmic figure that occurs in the space of one beat, and, in the case of these exercises, unless notated, it will be the rhythmic pattern that is happening in the space of one second.
Groove
A groove can be felt as a quality of persistently repeated rhythmic units.
What I Mean By “Get Your Groove On”
It is helpful, when learning a new rhythmic concept, to execute the new rhythm over and over again to a simple drum track. You could use a metronome, but drum tracks tend to be easier to follow, especially if the drum track is in the same time signature or groove as the one you are learning. Special shout out to Lumbeat for making these drum tracks accessible to the world!