What does the grey zone indicate on the fitness graph?
Have a look here:
Guess that should sum up the Fitness Graph Zones pretty good ^^
Going up the legend, the grey circle (-10 to +5) and grey line indicate what I call the “Grey Zone.” You don’t want to spend too much training time here because there’s not much happening that will improve fitness. You’re sort of at a plateau in training. This is typically the zone you are in during a rest and recovery week, when tapering for an A-priority race, and when returning to hard training following an extended break.
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