Imagine a normal graph with an X and Y axis. X is rate of movement through space and Y is rate of movement through time. The Vector (length of the arrow) of your movement through X-Y (space-time) has a constant length. So if you move at a greater rate through space, you must move at a lower rate through time to keep the arrow at the same length (Pythagoras).

At the speed of light the arrow is perfectly horizontal, with no movement through time and at a velocity of 0 you are maximally moving through time.