Feeling sick
I have been spinning for over 2 years and attend at least 3, if not 4, sessions a week. I am fit, of a healthy weight, and bring 500ml of water to drink in a 30 minute class.
At least once a week, towards the end of the class, I have to reduce my intensity as I start to feel sick to the point where I'm scared I'm going to vomit. I'm genuinely calculating the distance between my bike and the nearest bin.
I find that this happens mostly when my heart rate is in the upper end of zone 4 (according to my watch, I am aware of inaccuracies there) so I have to ease off and keep it in lower 4/upper 3.
This morning, I had breakfast 2 hours before my class but I drank two strong coffees, so maybe that was it? I woke up quite hungry though, so maybe I was under-fuelled?
Any advice? Tia!