first of all I think it's completely unhealthy for the body and the soul to be 8 hours a day sitted in front of a computer working seven days a week in the type of job I have.

I can feel my belly getting bigger and my legs getting wobblier by the minute. I used to be a person that walked like for hours, every day, I don't have a car, but now that I'm stuck in the same position all day long well I don't do that anymore.

I was thinking of going up on the elevator and stopping 5 stories before my floor, and walk up the stairs up to my office and that would be like an excercise. Is it a good idea or will I drop dead from a heatattack???

I'm 23 by the way.

Walking up 5 flights of stairs will not give you a heart attack... that is unless you have some kind of heart condition to begin with. I'm just thinking though, walking up 5 flights takes what, 10 minutes? They say you need at least 30 minutes of cardio exercise a day. So I doubt that 10 minute walk up the stairs would be enough to make a difference.

it's a good idea.

when you get used to the 5, bump it up.

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That's the whole trouble. You can't ever find a place that's nice and peaceful, because there isn't any. You may think there is, but once you get there, when you're not looking, somebody'll sneak up and write "Fuck you" right under your nose.” - J. D. Salinger

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it's a good idea.
you could try going up and down the stairs during breaks and after work too.

good idea, but you probably need to vigorously climb them/run to get some good exercise going.