Practice without a clock
Endless Mode has no timer and no lives. Values keep coming until you stop, which makes it the right choice for warming up, for trying a difficulty level you have not attempted before, or for practising when a countdown would just add stress you do not need.
How to get value out of it
Without a clock the score is not the point — the accuracy figure in the stats panel is. Pick a target such as fifty consecutive entries above 98 percent accuracy and treat the run as finished when you reach it.
This is also the best place to work on posture and hand position, because you can stop mid-run and reset without losing anything. Five relaxed minutes here before a timed test tends to produce a better result than jumping straight into the timed test cold.