This is an effective indoor training program designed to improve your aerobic system and keep you motivated all winter-long. There are 3 options available based on your experience. Choose the level that best describes you:
Level 1 - "I am new to indoor cycling and structured training."
Level 2 - "Indoor training nothing new to me, but structured workouts are."
Level 3 - "I have experience riding indoors and with structured training."
See a sample week here.