Female Forum has a use­ful post on high inten­sity training:

“The one thing that most women com­plain about when it comes to exer­cis­ing is many will sink an hour or more a day into exer­cis­ing and still not receive the results that they want.

“Exer­cis­ing can be time con­sum­ing and even a lit­tle frus­trat­ing when you’re try­ing to squeeze the most of your exer­cise time. It can be even more frus­trat­ing to focus on all of your trou­ble spots in one workout.

Read more at femaleforum.com