The internet is jam-packed with sources of "news." Most of these sources don't produce news themselves; rather they re-post articles, press releases, etc. And so it came to pass that a post I saw this week referenced a press release from March that prompted this post. End backstory.
The post from March (which showed up in lots of places...see previous paragraph) looked like this one: http://www.sciencenewsline.com/news/2017030718000015.html . It's about a study that showed exercise--especially High Intensity Interval Training (HIIT)--"...caused cells to make more proteins for their energy-producing mitochondria and their protein-building ribosomes, effectively stopping aging at the cellular level."