If the TravelFit video still resides on your hard drive (the original download), you simply need to drag it into the iTunes Movies window (click on "Movies" in iTunes and then drag TravelFit into the window), then drag TravelFit from the "Movies" window onto your iPad.
If you do not have TravelFit on your hard drive any more and it only resides on your iPod, you will need to re-download it from our site (If you no longer have the link, please contact customer service with your original purchase information and they will provide you with one). Unfortunately, you cannot copy a video file from your iPod back into iTunes and then onto the iPad. Apple does this to prevent people from simply copying all their music/videos into someone else's iTunes library and "appropriating" it.