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How do you do that? Bring my knees up?  How do you bring your knees up?
by jumping...this is similar to a physics problem that has come up in m class, except the person is standing on a set of scales in an elevator.If the elevator accelerates downwards at the same rate as gravity (9.8ms-2),then he reaction forces would result in you becoming 'weightless'.Remember, that weight and mass are 2 different things.HEre is an interactive animation about weightlesness.
Did you ever ask the greengrocer for 50N of potatoes?
Less energetic ways of weighing less, when measured using bathroom scales, are to prop the scales up against a wall and lie on the floor with your feet only lightly touching them, or simply hold the scales upside down above you, with them lightly touching your head.
No, I meant, when I jumped, I pushed down on the scales and I became heavier!