The real problem with this is sedentary. There are so many studies that try to prove "X improves endurance" and run a study with sedentary people. The problem

The real problem with this is sedentary. There are so many studies that try to prove "X improves endurance" and run a study with sedentary people. The problem is that when you have sedentary people do any kind of activity that increases heart rate regularly, they will come out of it with improved markers. The learning curve here is pretty steep. It tells us nothing about the actual activity you were trying to test.