At its most basic, a drumkit rock rhythm can have just just four components: a snare drum hit on beats 2 and 4, a bass drum hit on beats 1 and 3.
The pdf poster features eight variations on this idea, each adding a slightly more complex hi-hat pattern or bass-drum variation.
The bass drum is coloured red, the snare green and the hi-hat blue.
Small groups of students can play these patterns together. Allocate one student to the bass / snare pattern and a second to the hi-hat pattern. The hi-hat pattern can also be duplicated on the ride cymbal and (lightly) on the bell of the crash cymbal.
Before playing the patterns on the kit, have students practice using their hands and feet while sitting on chairs. Rehearse the counting patterns, particularly for the two last rhythms with the more complex bass pattern.