How do I remember choreography?
You remember choreography by storing it in more than one place: in the body through repetition of small sections, in language through cues you invent for each move, in the mind through rehearsal away from the floor, and in long-term memory through a review before sleep. Forgetting happens when the routine only ever lived in one of them.
Sections and repetition
Drill small sections until your body does them while you think about something else. Fifty runs of an eight is normal. The reason to overlearn is that under pressure the mind goes blank and the body has to take over; it can only take over what it has done many times.
Cues in your own words
Name the moves. "Reach, snatch, sit, roll." Snap on the accents, breathe on the holds, make a sound for the drop. A routine with words attached is a routine you can rehearse without moving, and a name is a handle when the sequence slips.
Mental rehearsal
Run the piece in your head, in time, with the music playing if you can. Notice where the picture goes fuzzy; that is the section to drill next. Do it on the way home and last thing at night.
Sleep on it
Movement learned in the evening is consolidated overnight. A short review before bed and a run in the morning is worth more than an extra half hour the night before.
Questions people ask
Why do I forget it the next day?
Usually because it was learned in one long session and never reviewed. Spread the learning over consecutive days and review before sleep; retention improves within a week.
Should I watch the video or dance it to remember?
Both, and in that order less often than you think. Watching once a day keeps the picture; dancing keeps the body. Recording yourself and watching that adds the honest version.