While it seems the Wim Hof Method (WHM) is great for an energy boost, mindfulness meditation actually outperformed it in a couple of areas: significantly higher accuracy on executive function tasks; and significantly higher objective sleep quantity (total minutes asleep). Personally I’d rather have slightly slower reaction times and better accuracy than rapid “hot takes”.
Funnily enough these aspects are not mentioned on the linked article; see the full study here:
https://rdcu.be/eUPOv