Unusual stretches / crunches etc

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Im new to mfp, but not dieting!!

I tend to get bored with the usual abs, stretches, squats etc. does anyone have any fun, unusual, exercises to try? I do planks, side planks with dumb bells, side step squats, heel lifts and bike crunches ATM. I also do leg lifts to a 3 count up (so up, 1,2,3 down on 4)