Abstract
Scientific knowledge has developed thanks to the proliferation of scientific journals that publish research providing evidence. However, the information received by the population, especially adolescents, flows through other channels, such as social media. While rigorous research generates knowledge, the speed of social media favours the spread of incorrect information. In this ecosystem, influencers play a decisive role. Their communication skills and aesthetics often give them a perceived authority that sometimes lacks scientific basis. When it comes to physical exercise in fitness centers, and even more so in strength training using weights, the selection of information is a key skill. In order to distinguish between evidence and beliefs, it is necessary to work from a rigorous analysis of the information in order to provide recommendations that can be integrated into the educational curricula of the subject of Physical Education.

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