The Norwegian 4x4 HIIT protocol can be performed safely and effectively several times per week by adults, including those aged 65 with diabetes.

“there are, I mean, hundreds of studies on, let's just use keep using the Norwegian 4x4, for example, but adults can do that protocol safely, effectively, several times per week, and they're not burning out. They're not it's not unsustainable. I mean, you hear all these words and it's just like for the people doing the research and even in graduate school, I was a part of several of these different studies where we used the Norwegian 4x4 and we were looking at the effect of on endothelial function and we had people who were 65 years old with diabetes coming in and they were doing a couple of these 4x4 protocols a week, 85% heart rate max.”