Welcome to the Core Advantage Interval Timer. Choose from our list of pre-built workouts or build & save your own with custom. You can even listen to music while you train. Workouts include: - 8:12s. The most effective and efficient way to improve anaerobic fitness on a spin bike - Fartlek Timer. Swedish for speed play, use for a randomised workout of hard, moderate and easy effort - Game Fit. The world’s best sports replication drill designed to replicate the movement patterns, muscle groups a