One way to practice this is to play along with a metronome.
Get a metronome, and set it to a slow tempo.
If you are practicing scales, for example, play along with a metronome, and try to make sure your rhythm is perfect.
As of early 2006, Metronome is still without a publisher.
Intractive metronome training uses a similar instrument as the metronome used by musicians to keep time in order to train individuals to develop their motor and timing skills through repetitively tapping the beat.