She is applying the FITT(Frequency, Intensity, Time, and Type) principle and she is applying the Time part of it. It is correct because she is adding more time which is adding more time in the FITT principle.
Alexa is using the FITT that is Frequency, Intensity, Time, and Type principle. She is making use of the Time part of it. It is correct as she is adding more time that is in the FITT principle.
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