With over 25 million hits on YouTube, trainer Tiffany Rothe is transforming bodies all over America with her free online workouts. She promises her routines are fun, fast and, most importantly, effective. Watch her get moving with Dr. Oz and his audience.

View Part 1 of Workout with YouTube Star Tiffany Rothe.

Whether it's falling or flying, Dr. Oz has the answers to why you have the dreams that you do and what they might mean.