Improve your Cycling Endurance and Stamina by using the carefully selected workouts in the Endurance Builder 5-Pack! Each one of the endurance building workouts chosen for this 5-Pack offer 90 minutes or more of intense interval training designed to help you ride for longer periods of time at greater speeds. Ideal for any serious cyclist preparing for a long distance event incorporating these workouts into your structured training program once or twice each week will take your cycling and fitness to new levels! Spinervals workouts chosen for this 5-Pack total 10 hours of intense training and include: 5.0 - Mental Toughness (90 min) 9.0 - Have Mercy (120 min) 13.0 - Tough Love (180 min) 15.0 - Have Mercy The Sequel (120 min) 23.0 - Time Saver I (90 min) Buy the Special 5-Pack for only $124.95 and save! Improve your Cycling Endurance and Stamina by using the carefully selected workouts in the Endurance Builder 5-Pack! Difficulty Rating: 9.6 Note that 9.0 and 15.0 are compilation workouts using various segments from other spinervals DVDs to make a complete workout and that 23.0 has three 30 minute sessions that can be done at once to make a complete 90 minute workout.