Theatre training helps make people more comfortable being themselves, communicating with others (verbally and non-verbally) as well as teaching you to focus on breath and using your voice. It's public speaking but with style and goofieness. It's generally a pretty judgment free area and is also just a lot of fun. This obviously isn't for everyone, and I am sure it really depends on where/how you do theatre, but I have been very lucky and have found it to help me in my daily life.