Basically it is a half time groove because instead of the kick on 1 and 3 and the backbeat on 2 and 4, this groove has the kick on 1 and the backbeat on 3. Thus they are played half as much as regular 4/4 grooves. The tripplet pattern makes it a shuffe groove as the ostanato is not played in its normal eigth or sixtenth note positions. Here is a very basic Half Time Shuffle Groove. I am currently playing this groove as part of my regular practice everyday for 10 min. I am at around 120 bpm right now. I can wait to get faster and then start adding some more advanced sticking.