When you aren't practicing specific pieces for a concert or chair test, play what you like. It makes practicing more fun and it can be a good challenge (some film music out there is pretty complex).;
, If you're practicing for, say two hours, take two or three 15min breaks to stretch, get something to drink/eat or just move around. Then go back to playing and continue taking breaks as needed.
,,, Every time you get through a piece without a single mistake, have a healthy treat you love like fresh raspberries, a small piece of dark chocolate or a favourite low cal savoury cracker.
 You don't have to play at the same time or play the same tune, you can take turns.

Pick music you like.
Take breaks.
Play to an audience that won't mind if you are not perfect, like your cat or dog if you have one!

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Record yourself playing and review your own performance.

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Practice in front of a mirror, you might amuse yourself with your own comedy concentration face.

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Reward yourself!,
If you have a friend who plays an instrument, you could practice together.
Try playing your music in a different key, it can sound very cool and it always practice more fun.
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