Watch the Week 2: Right Hand Exercise online guitar lesson by Roberto Dalla Vecchia from Flat Out Flatpicking
Right hand training is extremely important in flatpicking guitar. Practicing this exercise with a metronome will greatly improve your overall playing. Do this regularly to build and maintain a strong and accurate picking hand.
Be sure to alternate your strokes correctly, and to play the notes evenly, with neither stroke louder or softer than the other. The most common problem with alternate picking is having stronger downstroke than upstroke, be aware of this.