Take a brisk walk outside or even around the office. This can help to get your blood flowing and increase alertness. 

Incorporate short bursts of physical activity, such as stretching exercises or quick desk yoga sessions. This can re-energise both your body and mind. 

Stay hydrated by drinking water regularly throughout the day as dehydration can contribute to feelings of fatigue.  

Consider increasing natural light exposure or using a daylight lamp, as this is believed to improve mood and productivity. 

It's also important to practice good posture while seated at your desk to prevent slouching-induced fatigue. Consider using an ergonomic chair if possible. 

In case you are someone who feels sleepy post-lunch, try to do small bursts of activity such as taking the stairs instead of the elevator or doing some desk exercises, which can also combat drowsiness. Taking a few minutes to meditate, focus on deep breathing, or simply relax and clear the mind can rejuvenate energy levels and improve mental clarity.

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