Brief Answer:
Deep breathing exercises

Detailed Answer:
Hi,

Thanks for the query.

Deep breathing exercises would be help you in relaxation during work. You can follow alternate breathing technique where you close one of the nostrils and breath through the other for few seconds and do alternatively.

Take a break during work. Go around office for 5 to 10 mins. Chat with your friends or can read some jokes on your phone or watch a video you like. All these will divert your attention from the work for time being.

Follow regular physical exercises like Brisk walking or swimming along with meditation or yoga every day will keep you fresh the whole day and also will improve your capabilities of tackling with stress.

You can search through internet with different types of breathing exercises you can follow.

Hope this answers your query. If any further questions, will be happy to help.

Regards.

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