Step 1: Download

https://itunes.apple.com/in/app/time-exposure/id43...
Here's a direct link to the app. Download it.
It's just 40 MB, so it won't take a long time to download.

Step 2: Afterwards...

Tap the icon of the app to open it. Once you are at the start-up screen, click on the Mode and select Light sketch.

Step 3: Then...

After that, tap the Exposure tab.
This is where you get to choose the time for which the light is entering the camera's lens. Select Arbitrary, if you are not sure of the time that you will be capturing for.

Step 4: Jiggle and Wiggle!!!

It's time to do some exercise! Move that body of yours and do some dance steps with a LED throwie in your hands without the magnet. Or with it. Your choice.
LEDs are great as they last long and emit bright lights. Also, they come in a variety of colors!

(((( Above image was created by tying a led throwie to a string and rotating it. ))))

Step 5: Precautions

1. Keep the apple device on a level surface and make sure that it doesn't move while you do the dance.

2. Make sure that what you do is recorded, i.e. make sure that you do it in front of the camera. It's best to do this with a friend. If you are as lonely as I am, and don't quite have any friends coming over to your house, you could always the set the timer with the Delays tab. Set it to your wish, and then, just run in front of the camera and DANCE!!!

Hope you enjoyed this instructable. If you liked it, please favorite it and vote for it in the tech contest and whichever contest I would be entering it in.

Your friend,
The Pencil Guy