why do I feel like passing out or throwing up during exercise?

Here's the e-mail I sent to my personal trainer, but I always like different views so I'm pasting the e-mail:

"When I exercise and actually push myself like I did today, it may not have
sound like much to you, but during our workout I got this feeling during our
workout like I was going to throw up or passout and felt an overwhelming
feeling of heat. It wasn't during any exercise, it was when I was done and
stopped to move to a different exercise. It reminded me of when I was
younger and started some martial arts classes. It happened to me a couple
times during those classes and had to sit out. What do you think the reason
is for this to happen? I know I'm not lifting heavy weights and not doing
as many sets and not even correctly. Is this due to my diet and lack of
nutrients? Or due to my lack of strength? Lack of cardio? Is this a normal
feeling?"
 
Did you eat too much too soon before working out, how hot was it did you have to little or too much water?
 
Did you eat too much too soon before working out, how hot was it did you have to little or too much water?

It was during morning, and I was running late so I didn't have anything before workout. The actual temperature of the room wasn't hot, it was this overwhelming feeling of heat that I got over myself from working out, made me feel like quitting or passing out. I was with a trainer so I didn't stop, that's a reason I like working with trainers is that if I was working out myself I would've stopped much earlier, but I don't want to look like a wuss so I keep going. As for water, I had a few sips from a fountain here and there when the trainer asked me. After the workout I immediatly got a bottle of water and wanted to pass out for a nap, but I had to go to work. Like I said I remember this exact same feeling from my martial arts classes when I was younger, can it be due to dehydration?

Is this just since I'm used to being lazy?
 
The trainer should be able to notice symptons and stop you from working out even if you say that you are OK...I've only been doing a course for 3 weeks and i already know this...
 
Yeah, drink a fair amount of water while working out.
ANYTIME you feel dizzy or that you might pass out, STOP what you are doing and sit still for a bit. You are risking serious injury by pressing on.

And breathe right during your heavier exercises!!! Breathe OUT when exerting, IN when the weight is in a negative movement. (i.e. breathe OUT when pushing the weight off your chest during a bench press, breathe IN when you are lowering the weight back to your chest).
 
The "overwhelming feeling of heat" to me screams dehydration. When your body doesn't have sufficient hydration to cool yourself down, your sweating slows and stops and you just get hotter and hotter instead of sweating and cooling down. I suggest you CHUG water (not really, but hydrate a LOT more than you did) and see if that helps. Don't just start chugging water an hour before but drink consistently all day long and drink a lot. If your urine is yellow, you're not drinking enough. See if this helps.
 
I get that too, and for me it's definitely nothing to do with fitness. For me what happens is the following:
I feel hot, and my eyelids start to shut
I feel dizzy
My pulse seems to speed up dramatically in a very short space of time (resting for me is 50bpm)
I feel like I could pass out.

The reason for this, I think I have figured out. If you do not drink enough water and then do exercise with moderate amounts of rest you won't feel it. But if you do exercises in quick succession you have a problem. Drink water!
 
1) Perhaps you ought to seek medical advice (as you might have a serious condition).

2) If you choose not to do #1 above, then try drinking plenty of water (& cut out soda-pop), and ease into your training: plus don't train heavy or long (or particularly hard in any way, for awhile at least) & see if these steps stop the problems.

3) If #2 above doesn't work, then see #1 above.
 
I have never gotten a real bad feeling of passing out or throwing up, but I have come close. For me, it was all about my state of conditioning. It was painful, yes, because my body was a wreck. I was not used to doing any of the stuff, so it almost killed me, I could barely walk out of the gym some days. That whole period lasted 3 weeks or so, and I've never had that problem since.

Other than that, as many have said, drink plenty of water, and get good nutrients in your body before you workout.
 
I feel like that almost everytime I workout. Maybe my case isn't as bad, but I always have to lie down on a bench for a few minutes. It's usually after deadlifts when it is the worst. I don't really mind it too much because I figure it just means I am working myself that hard.
 
only time ive ever felt like this is after 3 reps of heavy clean jerks, which is friggin taxing! Seriously :p
 
You should always have water with you at all times. In fact you should make it a habit to always have water with you. Aside from the water you should drink a protein shake at least 30 minutes before you workout, because your body needs nutrients to give you the fuel that you need to do your workout. That's very important. What time do you have to be at work? You should get up early enough to have time to have a small light breakfast or make a good protein shake before you go to the gym. And then right after your workout you should have breakfast or make it the night before and have it right with you to eat after your workout so that your body can recover after your workout. I hope this helps.
 
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