这篇文章正好说到老年人的intensive exercise

https://www.nytimes.com/2017/03/23/well/move/the-best-exercise-for-aging-muscles.html?smid=fb-nytimes&smtyp=cur&smvar=eg

It seems as if the decline in the cellular health of muscles associated with aging was “corrected” with exercise, especially if it was intense, says Dr. Sreekumaran Nair, a professor of medicine and an endocrinologist at the Mayo Clinic and the study’s senior author. In fact, older people’s cells responded in some ways more robustly to intense exercise than the cells of the young did — suggesting, he says, that it is never too late to benefit from exercise.