Two different rhythm patterns happen in each bar/measure in this rhythm exercise. Beats 1 and 2 consist of 16th+8th+16th notes. Beats 3 and 4 consist of a dotted 8th+16th note. Lots of up strokes should be used here to help create fluid strumming. The count for each bar is 1e_a2e_a3__a4__a
You could also view the count like 1e(n)a2e(n)a3(en)a4(en)a
Here is the Guitar Pro 6 tab for this lesson:
John Taylor - guitar and bass instructor for Mile High Shred.