Hardest physics question/task. No naysayers please! :) Thanks Here's The Challange: I realize that this may be better suited to be posted on a magic/illusion type forum, but without implementing gimmicks and gadgets to perform this is more a task/question for physicists than illusionists. I am really grateful for any help I receive, and the title isn't representative of a pretentious attitude. I just can't stand it when people deem something impossible or dismiss a viable thought or idea as impossible without exerting any effort to solving it! :) (though I'm sure there will be people who will focus more on the "No naysayers" title rather than the question itself. )So thank you for any help. Okay, here is the challange/task that I am trying to overcome. It isn't very hard to understand how one would achieve this, but performing it is a different story. The forces at play are of course gravity, friction, other resistive forces, and a few others I'm sure I forgot. Imagine standing on one foot with the other leg off the ground as in the picture provided. Now imagine the foot that is on the floor sliding forward without placing the other foot down or holding on to something. There are two main groups that I would say it is achievable by, the gadget way and the non-gadget way. And by gadget I mean a device of any kind that allows you to do this(rollerblades). Without Gadgets I am wondering if it is possible to do without the aid of some kind of enhancement. This is why I am asking physicists! Such as a weight shift simultaneously of your suspended leg moving backwards as the foot on the floor slides forward. Anything you can think of that would allow you to do this? I am almost sure that with the proper leaning position (to give yourself something to pull against) and proper muscle strength it is possible. But I could be wrong. What do you think? Is there a way to do this without gadgets? With Gadgets I imagine a device within your shoe that vibrates, which would disrupt the force applied by friction, and allow you to more easily slide your feet on the floor. That is my best idea when it comes to this! How about you? Of course there's always WHEELS, but that is worse than cheating. I thought about magnets, but couldn't think of a way to apply them here. Anything from you guys? Okay, so as I said, it is a hard task to accomplish. But I think it is possible to not defy the laws of physics, but deceive the eye to thinking you have. Keep in mind that a JERK or jump forward is not sliding. There is a move in dancing called the (reverse) running man that is a lot like what I am talking about, but it implies both feet and a JERK movement to send the feet forward. Which is very wrong. Here's a good example of what I am NOT talking about: So what do you think? If you trained long enough, with sufficient strength in your quads and calves and a good leaning position(think smooth criminal lean by MJ), I think you could pull it off? All help with and without devices is welcomed! Thank you very much.