What gym excersises can I do that won't put any pressure on my knees at all?

I have a knee injury and can't put any pressure on them at all. I am not aloud to do any cardio such as treadmill, rower, etc... and no weight training standing up etc. Does anyone have any ideas of any excersises I can do in the gym that I can still do? Ideally, I would like to do something cardio or weights, but just can't think of anything that doesn't put pressure on them, or twist them in some way. I have been on a programme of weight loss and fitness and have lost 2 stone to date and don't want to stop excersising!

Any ideas for a frustrated lady will be much appreciated!

Many thanks!
Sorry for rubbish spelling!

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