To elaborate; I literally cannot focus on a workout, particularly a cardio routine, for longer than 5 minutes or so. If the best possible wourkout for me were to do 20 minutes of rowing, running, or cycling, I will literally want to kill myself after five minutes. Typically it won't come to that, so I'll just half ass it, call it quits and take the walk of shame home, bothered, unmoisturized, unhappy, out of my lane, unfocused, languishing. This is not due to over-exertion or the overall difficulty of the exercise but I guess some kind of latent inability to focus on any task for longer than the bare minimum.
I guess the simple answer is "Just mix it up, doofus", but when I do that I end up just half-assing even more. What is to be done?
The best cardio is doing it to go places. When you need to run or bike somewhere, there's really no way around it, and it just fits into your day. It's no longer a chore that you have to do, but an integral part of existing in a broader area than one single address.
"Cardio machines" (excepting ellipticals and stationary bikes for people with bad joints) are the absolute worst, they take away the majority of the experience. They are the refined white flour of exercise.