This guide provides high-intensity interval training (HIIT) workouts for calorie burning, increasing lean muscle, and fat loss for women at any fitness level. It explains how high-intensity interval training differs from other forms of exercise and why it helps achieve maximum results in minimal time; the types of post-exercise recovery and their benefits in improving performance and decreasing injury risk; high-intensity interval training protocols, when to use them, and how to determine which ones to use; and types of equipment. Subsequent sections contain 74 lower-body, upper-body, and core exercises, with information on selecting them, and 16 workouts and advice on planning. Video clips of exercises and one workout are available online. Annotation ©2015 Ringgold, Inc., Portland, OR (protoview.com)