Candidates can reduce stress during UPSC preparation by incorporating regular physical activities, mindfulness practices, and maintaining a balanced schedule. Engaging in activities like yoga, meditation, or exercise helps alleviate anxiety and enhances concentration. Setting manageable study goals, along with taking periodic breaks, prevents burnout and maintains motivation. Additionally, seeking support from peers or mentors can provide valuable encouragement and guidance, allowing candidates to navigate the challenging process more effectively and maintain their mental well-being.