My spouse, a graduate of NYU drama school, has shared with me some amazing advice for how to improve your Breath and speaking. I think all of us with MS eventually Will have to deal with slurred speech or problems in swallowing. This could be very serious, here's her advice that I have followed and it has helped me greatly:
To open up your Chest Muscles and strengthen your chest muscles, it is all about controlling exhalation.
After a deep breath exhale by making noise using your lips or Tongue. For example a raspberry sound (stick your tongue out vibrate your lips around your tongue in case you don't know what a raspberry is.)
This develops your chest muscles by controlling exhalation.
Find your Soft Palate, located at the roof of your mouth, with the tip of your tongue. As you breathe in, press that spot and then release to make a sound like "KAH."
This will help your soft palate lift and open the back of your mouth.
The plan is to help your mouth release breath more fully as you speak and attempt to swallow.
These are exercises that singers go through every day. Begin each morning by taking a full breath in through your nose and then exhaling through your mouth.
These tips have helped me greatly during my MS times of slurred speech and difficulty swallowing.
KAH KAH KAH