This is probably just an illusion and nothing to worry about. If this continues, consult your doctor for other possible reasons.
Dizziness brought on by heat or exercise can be caused by dehydration and/or low blood sugar. (Since this was originally put in the Migraine category, I will also answer that both dehydration as well as low blood sugar can trigger migraines, and migraines can cause dizziness. Also, there is something known as Exercise Induced Headache, whereby just by doing exercise can trigger an intense headache. Dizziness may be a part of that headache as well.)
By doing tatti
He was shaking hands with people at a reception.
You shouldn't, You should be looking straight forward, holding your neck back can cause injury and of course dizziness which you don't want especially if you're holding weights.
Exercise is what you do, and fitness is what you get from doing exercise.
Exercise is what you do, and fitness is what you get from doing exercise.
Exercise is what you do, and fitness is what you get from doing exercise.
It all depends on the exercise that you do.
The answer for the worksheet you are most likely doing; is I. Solid.
by doing exercise
It may be you are doing it standing up and his knees are shaking
When muscles get used to doing an exercise a lot, and remember the exercise.