Watch the A Form: Trill Exercise online guitar lesson by Dave Celentano from CAGED Commander
This trilling exercise highlights C major chord tones while outlining the 'A form' major shape. Notice the first note of each trill is held with the index finger while the middle or ring finger does the hammer-on and pull-off. It's also great for developing quick and seamless position shifts and string hops. The two notes at the seventh fret/D and G strings are the only two notes that are relocated to accomodate the trill technique.