When playing fast, even moderately fast, picking with all down-strokes becomes tiresome. To use your right hand most efficiently, you will want to alternate between down and up motions from note-to-note. This can apply to single notes as well as chords.
This old surf rock song example introduces a new technique called tremolo, where you quickly alternate your pick on a single note, playing several rapid notes in sequence. Every single note in this song, except the final note, is played with tremolo.
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Use this exercise to start getting more comfortable picking notes with this new alternating down/up motion. Start slow and gradually speed up your tempo.
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