Play each note by lightly grazing the string with the pick. After striking the note, bring the pick back over the string and strike the next note with another upstroke. Try to use minimal motion. Only move your fingers and, or wrist as much as necessary to strike the notes. You can use only your fingers without moving your wrist, but do not "lock" your wrist in place. You can use only your wrist, but do not "lock" you fingers in place.

Any motion you make or effort you expend that is not aimed at playng notes is wasted motion and effort. It will only make it harder for you to play the scale and ultimately make it harder for you to improve. An even, relaxed, untense motion is what we are after.

Again, keep in mind to go slowly and evenly. Don't rush or try to go faster than you can while maintaining an even spacing of the notes.