“Generally, a woman has the same treatment schedule and will feel good at certain times during the chemotherapy cycle. When she is feeling strong enough to exercise, she should. If she is not feeling well, rest is important.”
Exercise is highly recommended when you feel you can tolerate it. Choose exercises that you can comfortably complete without pushing too hard. Though the focus of the link above relates to Ovarian Cancer, this same concept of exercise is applicable to all GYN cancers.