Spinervals is a series of indoor training videos for cyclists. The series was created by former pro triathlete Troy Jacobson and traces its roots back to 1995. The series has not seen a new workout in about four years but is experiencing a resurgence during the pandemic. All in all, Jacobson created 50 different workouts under the Spinervals umbrella, tailoring them for a variety of training needs and energy systems. The workouts range from long, virtual rides aimed to simulate courses like Ironman Lake Placid, to high-intensity sets with the goal of training power and explosiveness. The series was originally distributed on DVDs but has since moved to streaming. The Spinervals concept was born out of a regular weekly trainer session Jacobson held for his Baltimore-based training group. The series featured pro triathletes like Joanna Zeiger, Greg Watson, and Lee DePietro, as well as regular relatable triathletes from around the country. Today, Jacobson is an executive coach and consultant based out of Tucson. The fundamentals and methodologies of the workouts remain the same and have been used by thousands of cyclists over the years. Spinervals has been the original indoor cycling workout series since 1997. The website offers a free 30-day trial.