I have never seen so many 'reasons' to remain unhealthy in my life. The main 'reason' seems to be that there is not enough time in the day. Well, I work on an RAF Station in a mixed service unit which is without doubt one of the busiest units in allof Her Majesty's Forces. We are all extremely busy, but I can assure you that not a single Technician/stacker/admin type is any busier than me. I don't have any breaks, I eat my lunch at my desk and my working day is typically 0815 - 1730. I also have a 40min commute either side of that. My working day is not untypical of my colleagues and yet we all, including our light blue types, manage to find time for phys. Even if it is in our own time.
If you want to stay unhealthy and unfit that's one thing, but don't make up lame excuses to justify your lardness.