To me, exercising to keep fit and making sure you eat healthily
or is healthy is a self responsibility. Why? It is your own body,
your own life, and it is you to suffer when you regret not having
do all the "punishments" to your body earlier in your life.
True, some may say that they do not have time; they have to work;
they have to study. I myself is a perfect example now: I'm in my
final year in uni, and I overload myself to the maximum number of
modular credits; I have to spend time with my girlfriend, my family
and my friends; I have to meet deadlines for projects and homework
in uni, not to mention facing many tests in the semester; I have
time for leisure (sgf posting, tv, etc, no time for outings yet
only). Yet I can manage the time for exercising 5~6 days a week.
When you claim you do not have enough time for exercise at least
twice a week, just think and ponder: Do you have more or less time
as compared to me. Is just taking at most 2 hours of your time a
week (7*24 hrs) for exercising too much to ask for? If so,
why?
When I mean exercise, it can be either intense or not intense.
Intense are those that make you feel extreme tiredness when after
you are finished with your exercise. Not intense are the opposite;
this includes perhaps a chin-up training session, where you just do
3 or more sets of your max rep. It can even include just doing
50~100 bodyweight squats at home while you are watching your
TV.
All said, it is all about time management and nutrition. Time
management is where you plan all that you are going to do. For me,
since my time is almost always filled, I planned fixed time slots
for my exercise. Suppose I missed it, I will try to plan another
time slot on another day. Plan your time so that you have enough
time for sleep. Sleep is extremely important for recovery so that
you can continue with your work.
Nutrition is also important for recovery. In my opinion, if you
cannot recover fast enough, you won't have the energy to do your
work. Make sure your meals consist of a balance of fibre, protein
and carbohydrates. In addition, eat fruits whenever possible; the
antioxidants help minimize damage to your body by oxidants, and
they assist you in your recovery.
So, start planning, start exercising, and start being responsible
for your body. 
