Practical exercises to improve public presentation skills crucial for UPSC include speech practice, group discussions, and participation in debate competitions. Candidates can record themselves to evaluate speaking styles and body language. Joining organizations like TEDx or Toastmasters enhances oratory skills through constructive peer feedback. Practicing storytelling techniques and maintaining eye contact during presentations can also be beneficial. Engaging in spontaneous speaking exercises helps develop confidence and quick-thinking abilities essential for effective public presentations.