When we exercise, we expect to see improvements in health, fitness, or both. However, substantial research over the past couple of decades has illustrated that the magnitude of training improvements is highly variable between individuals, and a small number of people show no, or perhaps even negative, improvements to an exercise training intervention. These individuals are typically referred to as “non-responders.” Whis phenomenon is not unique to exercise, but new research is finally starting to take a closer look at this topic.
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