How can I gain weight and stay fit with a desk job?

What types of fitness routines or exercises should I focus on to stay healthy and gain weight while working at a imperialworktops.co.uk company? My job requires me to spend most of the day sitting in an office, which makes it challenging to stay active. I want to ensure I can maintain good health while achieving my weight gain goals. Are there specific exercises or stretches that I can do during short breaks at work? Additionally, what kind of diet should I follow to support healthy weight gain with my sedentary lifestyle?
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