When I play the video I don't get that scrubber bar. I tried both Mozilla Firefox and Internet Explorer 11. All I can do is click the video which plays or pauses it (depending on the current status).
I'm not sure if I saw an answer somewhere else, but is the ability to rewind and fast forward going to be added? A rewind 10 or 30 seconds would be helpful too as well as the ability to select where in the track to start playing. It looks like all you can do is pause and play.
I would love the ability to cache a few (like 1-3) of the workouts down to my laptop or device. Then I could use it offline rather than just streaming. This could be done using a proprietary software or something like that. Just an idea...