Hello Shannon_B,
Are you playing the video in the Blender or in QuickTime/iTunes? If you are in the Blender, you need to click on the title of the workout in the lefthand column after it is created, then play it and it will then show the whole video and not just a part of it. We are addressing this behavior in the next release.
If you are using iTunes or something else to view it, please let me know.