I'm very much interested in fitness but I don't know from the landing page what your service offers exactly.
It would actually be great if you could provide a sample of what you offer before asking people to signup. Maybe a video on the landing page, a demo account or in the best case scenario let them actually go through your UI and only ask for registration when they want to save some data.
I also think that the landing page should give an indication of what the UI looks like (in addition to the feature list that you currently already have). As a casual fitness app user I wouldn't sign up to a service if I did not have any indication from the landing page about the look and feel of the UI.
