If a particular exercise training intervention only works with a very specific sample under very specific laboratory conditions, the external validity would necessarily be very low.

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External validity refers to the extent to which the results of a study can be generalized to other situations and to other people. If an exercise training intervention only works under very specific conditions and cannot be easily replicated outside the laboratory or with different populations, its external validity is indeed low.

If a Particular Exercise Training Intervention Only Works with a Very