If you haven't been singing much, our friends at Sing at Work provided a few tips on getting your voice warmed up. These pointers carry over into your speaking and life.
Phil Mershon, our event director, worked with Sing at Work and they helped him free up his diaphragm and rediscover his singing voice after thinking he was done singing for the rest of his life. Here's his testimony.
Warm-Ups
https://www.youtube.com/watch?v=a5dCmm-Ex3s
Warming Up with Nani
Nani Alternate Breathing Method