Hi, I'm a above average fit male 23 don't smoke, I drink a bit, but I'd say thats about average. I go to the gym 3 times a week and play soccer 3 times a week on top of that. A few times when I've gone to the gym and it's crowded I feel myself getting lightheaded and slightly dizzy which would be because of the air-condition not working at its optimal. I start gasping like I'm tired and it seems like my oxygen intake is to low. Why would I be the only one who gets dizzy and no one else, sometimes I have to leave. I train in the morning to avoid to avoid a big crowd inside.
I don't know why you get "lightheaded and slightly dizzy" though I doubt that your oxygen intake is low. These are very non-specific symptoms, but are unusual at your age. If the symptoms persist I would suggest you check with your physician. It might be worthwhile to do a treadmill exercise test to see how you respond and to check the blood pressure responses.
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