Not doing the course, but I have several friends that are doing/have done exercise & sport science. I'm doing physiotherapy, so can probably give an insight into the course given exercise & sport science and physio are in a similar field. I imagine you'd be doing a lot of biomechanics (hope you like physics

), anatomy, looking at how exercise affects health, exercise prescription, research & statistics, and probably some public health stuff too (this is usually an aspect of every health science course, looking at the determinants of health, etc.).
They all have enjoyed the course (obviously because that's the sort of stuff they're really interested in), but there are limited jobs in the field - off the top of my head, I can really only think of places like the AIS & VIS, and maybe professional sporting clubs, that would have exercise & sport scientists, but even then almost all of them have post-graduate degrees (usually specialising) as well. And as vox nihili said, there are a
lot of graduates every year, competing for a handful of jobs. A lady I know who did her course in Queensland a few years back said that when she graduated, there were ~150+ graduates, and only 2 jobs in the whole state.
Every single person I know who has done the course has gone on to do post-grad qualifications in exercise physiology, physiotherapy, and other health science courses that have better job prospects.