Train Smarter
Training zones explained
What the colours in your workouts mean.
Zones group intensities by the effect they have: Recovery and Endurance build your base, Tempo and Sweet Spot build muscular endurance, Threshold raises sustainable power, and VO2max and Anaerobic build your top end.
In YourIntervals every zone has its own colour, so you can read a workout's profile at a glance. The boundaries are guidelines, not precise physiological limits.