This could be one of the reasons why the Dems are scheduling the debates for Saturday nights when the fewest number of people are watching. (They even ended the last debate earlier than scheduled.) If she looks bad, it won’t be seen by that many people, and could be more easily explained away by her handlers. If she was such a shining star, and in such great shape, they would want her exposed to the largest audience possible. They can’t afford to have her suffer a health episode in a public setting with the cameras rolling.
Out of nowhere Trump all of the sudden is mentioning Hillary’s health all the time. He is not picking on anyone else just Hillary. He is asking why she needs to rest so much.
My take is that Trump is very up on Hillary’s health and senses he can crush her with that.