I think he is inquiring more about whether there is a training benefit. I have often doubted the benefits of the cool down but Im also always in a rush after my workout so I “cool down” 1-3’ and call it quits, so that’s my excuse. If I had unlimited time, I would probably do something longer but wonder if there is any evidence to support the training benefit of it. There are also so many more tools to recover than Were available 25 years ago.