This is a good exercise to warm up your single strokes and dynamic control in general. It's tricky to accent the last stroke of the group of 6 and requires a fast "whip" of the last stroke which I find really warms up my forearms very well.
This is a classic rudiment. I always enjoy using this to warm up and applying it on the kit. Check out the collection "Applying Rudiments On The Kit" to learn more about how to orchestrate this rudiment on the whole drum set.
A classic rudiment. Make sure you play controlled accents and pay attention to precise execution and dynamics.