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If you don't want to walk then you could stick your 3DS inside of a jacket sleeve. Grab the end of the sleeve and the end where it reaches the shoulder part.
Now find a 25 minute episode of a show to watch. Move arms up and down to shake 3DS. Once you get into the show you forget you are even doing the motion. Should be at 4000 steps by the time the episode ends.
OR
Put 3DS in old sweatshirt sleeve. Tie end of sleeve to bed. Tie the other in to closet door tight enough that the tension pulls on the closet door. Stick a rotating fan inside closet. Tie string to fan and to closet door. As the fan rotates it pulls on the closet door causing the 3ds to tumble inside.
autism at work