The Four by Four Method

i really believe in personalized methodo, personalized training. And i'm going to tell you what i do in a second, because i don't like these methods. So threshold intervals are very similar to the four by four method, but i alize it. What i do is i start to build people up. I give them one minute with three minutes off. I build them up to two minutes with 3 minutes off and even lengthen the rest. Don't think that you need to do some silly method because it's it's got a name to it. You got to open up your mind and for yourself. Increase the amount of time over time. The principle progressive overlow, which