Breathing Exercises

• You should devote more time to breathing exercises in order to improve your articulation. You need to practice breathing with your chest rather than your throat, which will help you project your voice. You should set aside time every day to practice breathing with your chest for a few minutes until you have mastered it.
  
  

Pitch Practice

• You should set an objective to practice the pitch of your voice on a regular basis. Breathing with your chest will help you project, but you need to consciously adopt the right pitch -- usually a lower tone than your natural voice. Set a goal to regularly practice modulating the pitch of your voice while breathing with your chest until it becomes an unconscious practice.
  
  

Tongue Twisters

• Set aside time to practice word twisters in order to master that last element of articulation: pronunciation. You can try familiar twisters like "Peter Piper," or you can just pick out words that you find you are stumbling over when practicing your speech. Open your mouth wide when practicing and focus on each vowel in the word, reading them slowly and then increasing in speed as you get better at it.
  
  

Use Down Time

• A speaker who is serious about improving articulation makes effective use of downtime. Start reading out loud when you are alone. For example, you can practice in the car by repeating words you hear on the radio, or you can read out loud from a newspaper article. This exercise will also help you to retain the things you hear.
  
  

Pre-Speech Exercises

• Commit to learning some essential vocal exercises before you give a speech, which can loosen up your vocal chords beforehand. Before speaking, you should loosen your body by shaking up your limbs and twisting a bit, and you should yawn and twitch your face to loosen up your facial muscles. Finally, practice a few twisters beforehand to loosen up your voice.