I do a lot of driving for work and my home arrangements are not conducive to providing practice time, so sitting in my truck is where I typically find my self doing my workouts. Are there certain warmups/exercises that should not be attempted while driving?

I am aware of JV's caution against Ultimate Breathing while driving, and I've developed a stripped down and simplified version of it that works for me without resulting in dizziness or light-headedness: I take a slow, deep 90% breath and then push it out in staccato pants until I begin to get light-headed or run out of air, then take a couple of rest breaths and repeat.

Has anyone else successfully modified vocalises to make them more conducive to driving? Please share!

With all honesty vocalizing in your car is not conducive to long term vocal development, I strongly suggest you find a place and make the time to vocalize somewhere you can stand, even if its behind a dumpster in a store parking lot at night, find a place! You shouldn't have to accommodate to less then great conditions. I live in a place where loud noises is prohibited, so I do all my singing in my college practice rooms. I even go out of my way and practice in random city secluded areas after midnight to get in vocal time. Even singing while you are walking will be better for then singing in a car.

However, I understand your situation, i just wanted to let you know you are not alone and my frame of mind. I honestly believe you can do any vocal workout while you are driving under these two conditions:

1. Your eyes and conscious mind is focused on the road
2. You are sub consciously focused on improving your voice with the time that you have.

I built my entire voice by training in the car for years. But then again I don't do anything that leads to dizziness or blacking out (not sure what you're doing)

If all you can do is train in the car then that's what you should do. You can learn to support just as good sitting down as standing up. It's fine. Learn how to multi-task and give your brain a good workout.

The whole "don't train in the car" thing is just like that other vocal nonsense of "don't copy your favourite artist just be yourself" it's another flakey nonsense phrase said by those who don't live in reality

Train wherever you can whenever you can.

Phil Moufarrege
Grow-The-Voice.com

Luckily I drive a large truck that lets me sit up with decent posture while I drive, as opposed to the slouched position most personal vehicles force my spine to adopt. The greatest technical challenge is the bumpy truck transmission, which may actually be helping me by forcing me to compensate with strong, steady breath support and laryngial control to maintain an even tone.

The original question was concerning exercises such as outlined in RYV (p.33-34) where Jaime specifically emphasizes "DO NOT DO THIS EXERCISE WHILE DRIVING!" and long sustained "Sss" or "Yah" exercises, which may result in light-headedness/dizziness.

The best way to tell if an exercise is good or not good is knowing yourself. If you feel yourself getting the least bit busy or distracted tone it down or switch to another exercise.

I'm currently on a break from any vocal exercises due to a car crash, but before that I always do a lot of training on the road. Any practice time you can squeeze in will help. I use Jamie's mp3 tracks as a starting guideline. I always start with the warmups, then go into what I want to focus on. Breathing exercises (done lighter in the car), scales, slides, grit, etc. Sometimes to learn a specific technique or practice a note combination I'll lesson to a song with that has it and practice it.

Good times to practice in a car is anytime you're in the car. The added practice time will help.

I must interject here. Daniel is completely wrong on this one! Sorry, Daniel, not pointing you out, just want to shed some true light here. Regardless what any of you have heard by any sing or any vocal coach, working your voice in your car IS COMPLETELY FINE! If not, well, I guess my range and glass breaking ability is a fluke, as are all those RYV users who practice in the car. By the way, I shattered my first glass by voice alone while driving. Yeah, crazy stupid, but that's how it happened. Listen, most singers have lives that do kind of prevent extra practice time, so utilize the car. Stay away from any exercises that make you light headed, or if you start to get light headed, don't go any higher in range, and you'll be fine;)