What is 要 doing in 每天她要慢跑?
每天早上她都要慢跑一个小时。

I disagree with Tang Ho's answer [&quot;要 only indicates &quot;needs to/ has to&quot; here&quot;].
要 in the sentence denotes the sense of 将要 (going to).  It doesn't necessarily mean 必须，必要(has to).
The sentence is just stating a fact that she would be running for an hour every morning.  It might look inconsistent or ungrammatical from English stand point.  But I can't think of a better way to explain it in English.
都 here is to emphasize she is always doing it.