100 Quick HIIT Workouts: 20Minute Cardio Workouts To Burn Calories And Build Stamina By Myers, Dominique By Thriftbooks, Paperback

101 Upper Body HIIT Workouts: Short, Intense Upperbody Workouts For Strength, Fat Loss, And Conditioning By Myers, Erik By Thriftbooks, Paperback

Fit For Life 5 Simple Steps Establish A Daily Workout Habit: 20 Minutes Daily Workout To Lose Weight, Enhances Muscle Strength, Endurance, Flexibility By Dang, Andyn N. By Thriftbooks

HIIT Training Program : High Intensity Interval Training For Fast Fitness By Amy Boyce