@aciampa?
You know, I have a pretty simple, maybe too simple, concept of A + A training - it means "stay out of the red zone." If you're doing that, you're probably OK.
1:1 work:rest? No. But 10 kettlebells swings on the minute means about 15 seconds work and 45 seconds rest. And we have to put "work" in quotation marks because it can mean so many things. To use myself as an example, I love to give a lot of effort on a set of swings; nothing makes me happier than 10 swings, 2h, with a 40 kg bell and really going at it hard. When I'm doing something like that, and the clock comes around to the minute, and I don't feel ready, I just wait longer.
One thing I said earlier today (in this thread? or another?) was that ideally you start with a HRM and a clock, and you wean yourself off both over time. I think that's the right idea, so no hard-and-fast rule about work-to-rest ratios.
Interesting reading from
@CMarker here:
How Tabata Really Works: What the Research Says
If you're going really hard at it, and you're going to do it for some length of time, then yes, I think 1:6 might make sense. But there are so many variables that it's really tough to say.
E.g., I have been known to plan a swing workout, get part of the way through it, feel like the next set would put me in the red zone, and simply walk away and come back 5-10 minutes later. Am I doing A+A training? Beats the heck out of me, but I feel like I'm trying to keep to the spirit of it, which is
Exercise at an intensity level that, if continued, would put one in the red zone, but stopped short of that length of time, and followed by sufficient rest to do it again and again for some workout-like length of time.
Hopefully the above ramble doesn't add to your confusion.
-S-