“changes in … blood were potent but ‘transient,’ …. So activities would have to be repeated to provide any continuing [#cancer] protection, and it remains unclear how intense or prolonged that exercise ideally would need to be” — @nytimes https://www.nytimes.com/2019/04/22/well/move/why-does-exercise-guard-against-cancer-inflammation-may-play-a-role.html