Brand new, in the shrinkwrap, never been opened or played this is the Spinervals Aero Base Builder 5 DVD set.  This is the ultimate aerobic workout series for indoor cycling training.  Get out your stationary bike rig and get ready to build your endurance, improve your efficiency, strengthen your technique, improve your times and ride faster.  You will ride on the wheel of Coach Troy--one of the top cycling and triathlon coaches in the world.  There are 5 intense workouts--it will never get boring.  Included are Spinervals 16.0-Aero Base Builder I, Spinervals 17.0-Aero Base Builder II, Spinervals 18.0-Aero Base Builder III, Spinervals 21.0-Aero Base Builder IV, and Spinervals 25.0-Aero Base Builder V.  Each of the workouts are 70 min or longer and will really test you and get you into terrific shape or improve the shape you are in.  The overall difficulty rating is 7.5/10.

Aerobic intensity training is the foundation for success in cycling and triathlon.  For years, top coaches and athletes alike have know the benefits of aerobic intensity training including 1-increased mitochondrial density, 2-enhanced aerobic enzyme production and 3-increased capillary density---this is a scientifically tested and proven training program that will take your endurance and your performance to a higher level.  Train hard and train smart and you'll take it to another level for sure....

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