One of the biggest difficulties I have getting fit is the lack of metrics on progress. I have no way of knowing whether or not a workout is effective or whether or not I'm making good use of my time. Fitness trackers are available now although most of them only track footsteps which to me is useless (maybe I'm wrong).
In addition I also have a terrible time getting quality sleep. I wish there were a device that could monitor and debug my sleeping difficulties.