Starting with a simple rhythm on the snare drum, this exercise gradually builds throughout each measure. In the audio demonstration, each example is played 4 times before moving on.
The rhythm with the hands stays the same throughout. However, the orchestration around the kit of this rhythm (i.e. the pattern) changes. For example, #3 moves the first 4 strokes to the toms.
Example 2 introduces the hi-hat foot, which plays quarter notes throughout the rest of the examples. Example 4 introduces the bass drum. The bass pattern changes slightly throughout.
Take your time to become comfortable with each of the examples. See if you can get to #10!