A training principle which Robyn should consider before taking this break is: C. reversibility.
Reversibility can be defined as a training principle which asserts that any adaptation or exercise-related progress that took place as a result of training will be reversed when an athlete (individual) quits training.
This ultimately implies that, an athlete looses the effect of previous training when he or she quits training in accordance with the reversibility principle.
In conclusion, we can infer and logically deduce that a training principle which Robyn should consider before taking this break is reversibility.
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