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Recovery Load - This represents the amount of recovery needed using an exponentially-weighted moving average of XSS based on a 7-day time constant.
Could you elaborate on what units these are in, i.e. what does a value of 50 represent.

They are unitless. The higher the value, the more recovery needed. Recovery load is similar to Acute Training Load (ATL) only is based on XSS. Since Form = Training Load - Recovery Load, a value of 50 when TL is below 50 will mean Tired whereas if your TL is above 50, it means Fresh. These terms are somewhat arbitrary since the scales and values are very generic and each individual is different, hence the information is to be used as a guideline only. This is the general recommendation when using the standard formulas. In Phase II, this will look quite a bit different.