Varies: There is no specific dangerous heart rate during exercise. How fast your heart beats with exercise depends on a number of factors, especially your conditioning. If you are healthy, a heart reate in the 170's or even higher may be ok and tolerated.
Motion sickness caused by video games, sometimes called simulator sickness, is caused when there is a disconnect between what your eyes are seeing and what your body is feeling.
definitions - MOTION SICKNESS. motion sickness (n.) 1.the state of being dizzy or nauseated because of the motions that occur while traveling in or on a moving vehicle. Motion Sickness (n.) 1.(MeSH)Disorder caused by motion, as sea sickness, train sickness, car sickness, air sickness, or SPACE MOTION SICKNESS.