The claim, "You Can Run A Marathon Without Training," is true in the sense that you can complete the race, but physically, it can deteriorate your body and cause you to not perform to your best. Running a marathon without training can deteriorate your kidneys and heart, strain your muscles, and increase bone injury. This is because your body is not used to this activity and is shocked by this amount of exercise without breaks. Without stretching or even practicing running short distances, your body would be unprepared and not built up the tolerance for this activity. This claim is exaggerated, as you can run a marathon without training, but there are many health factors that would deplete your health by doing this.
Public Med https://pubmed.ncbi.nlm.nih.gov/24982707/ demonstrates how Exertional rhabdomyolysis can cause athletes severe muscle issues that need extremely quick treatment. It can cause muscle strain, swelling, and breakdown of muscles. This article highlights how running a marathon with no amount of training can cause muscle issues like Exertional rhabdomyolysis.
Also, https://fr.footactive.co.uk/blog/the-pitfalls-of-running-a-marathon-without-training states that it is physically possible to run a marathon without proper training, or any training at all, for that matter, yet it can create a higher risk for shin splints in athletes, plantar fasciitis, runner’s knee, dehydration, and overexhaustion. There are many negative factors in not training for a marathon, although it is possible to do so.
Another source, https://www.outsideonline.com/health/training-performance/no-training-marathon/, shows how runners who don't train for a marathon can experience severe post-race soreness, muscle pain, injury, and dehydration, all with a slow recovery in the end.
Overall, this claim is true yet exaggerated, as it can be completed, but with many negative health impacts after doing so that are not mentioned in this claim. Many sports coaches or professionals within sports medicine claim that they strongly advise training for a marathon to prepare your body for the event.