I am 35 year old male 5'10 155. Ever since I was a child, I have not
liked physical exercise. Now I would like to gain some muscle and
improve my health. Though, every time I start exercising in a short
while I start feeling very tired and I soon stop exercising all
together. How can I have long-lasting exercise routine? Please advise
me.

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Request for Question Clarification by maniac-ga on 30 Sep 2005 14:24 PDT

Hello Humblestudent2004,

Have you tried a gradual program (start simple and build up) such as
  http://www.statesa.com/gettingfit/5bx.php

This particular exercise program is an old one (over 50 years now) but
has served me well for over a decade (and I started it at about your
age...). You can do the exercises almost anywhere - the floor space in
a hotel room is enough.

Please make a clarification request if you want more than one type of
exercise program / alternative and any constraints you may have (e.g.,
low cost, must be indoors in a limited space).

  --Maniac

Exercising alone  - with or without machines -  jogging, just doing it
because you have decided it is good for you, is boring  - and
depressing if you so quickly have to admit that it is so tiring.
I would suggest that you find a group to join that meets regularly for
some light activity in a game or team involvement.  The important
thing is that it meets at least weekly and that it is organized to the
extent that you feel committed to attend, if only by promising that
you will be there the next time.
Of course, it would be nice if the other people were compatible, but
the good thing about sports is that you can also meet folks from other
walks of life and discover what interests them, a broadening
experience.
With this commitment, you should be able to incite yourself to a
little exercise between meetings, a little goes a long way at the
start.
You mention "gain some muscle".  I wouldn't make biceps and a
washboard stomach the goal, just work for more endurance, being able
to continue an excercise for longer, rather than using heavier weights
(if you workout with any).

Now what activity?  Depends what's available, of course.  Mixed sports
are good because competition is usually low-key.  Volleyball, tennis,
racketball, squash,  a cycling club that has day and 1/2 day outings,
inline skating ...
Sure, you'll be duffer at the start; invested in a few training
sessions for a racket sport.  You might surprise yourself.  I know a
man who took up tennis on retiring after his third heart attack.  He
also had never been a sportsman, a little overweight (not your
problem).  I even joked to others when I saw him taking his first
lessons that he would never become a tennis player, but he did,
quickly able to play well enough to join those who have been playing
for decades.

This is just one man's opinion, and just a free comment, no "answer"
to your question.

Once the body is accustomed for rest, idling and easy life it is
difficult to bring back it to a rigorous exercise schedule. To proceed
ahead one solution is to start with light exercises, long walks etc.
and then to shift to the difficult ones. Moreover when we do not exert
physically we do not know the status of our body - how much physical
strain it can take? In fact many times the reason for a fatigue after
even a light exercise is not the body but some infection / disease
like: worms in the gut, lack of carbohydrate in the food, stress,
smoking/drinking/drugs etc. Once it is checked/cured body may regain
its vigour and you do not feel exausted after exercise!

Thank you, myoarin. 
Joining team activity seems to be a good idea, but I am not sure which
sport to play. I was not really good team player when I joined game
that requires teamplay, such as dodgeball or baseball.

Thank you, bhanee.
I have never thought about infectious disease would be a course of
fatigue. although I have seen a doctor already for cure of
fatigueness, they didn't mention none of courses you mentioned.

I've been using the workout programs on this site with my basketball
team, and we've enjoyed them:

<a href="http://www.online-basketball-drills.com/dir/conditioning/">http://www.online-basketball-drills.com/dir/conditioning/</a>

We are a bunch of "over the hill" athletes (35+) who are trying to
hold onto our youth.  The conditioning program and plyometric workout
fit into our pre-Saturday night basketball game routine.  Good general
workout- even for the non-ballers.