Endurance is a broad term. Different types of endurance (short -, medium - and long term) are fueled by different energy systems. The first one or two maximum muscle contractions are powered by the phosphates in the muscle cell. After that, short bursts of up to 12 seconds draw their energy from the creatine- phosphate reserves. These two modes of energy production are known as anaerobic (lacking oxygen) alactic (without significant production of lactic acid). Longer efforts, up to roughly 3 minutes, primarily make use of the anaerobic lactic system, also called anaerobic glykolysis, i.e., the utilization of sugar in the absence of sufficient oxygen. Finally, even longer work is primarily fueled by the aerobic system. Here, oxygen is available in sufficient amounts such that sugars and fats can be oxidized in the Krebs cycle. It is this system that will be in the scope of this article.
The aerobic system is, amongst other things, relevant for recovery after training ses…
DISCLAIMER: This is published quite some time after the actual events. I'll explain my reasons for holding this one back in the post.
2016-03-31: Just went through my first 10,000 swing workout. A couple days ago, I finished reading Dan John's Book "Can you go"[DJ2015] and now I'm into "Before we go". Most of that stuff I already read at some point, mostly on [T-Nation] or similar sites. So really, there wasn't anything really new in the book, Still, for some reason I've decided to give the 10,000 swing challenge a shot.
You see, my life is rather turbulent at the moment, to say the least. I won't be going into any detail here (as Pavel Tsatsouline pointed out, oversharing is a dysfunction of our society [TF2015]), but suffice to say that I'm having a rough time in many areas of my life. The good thing is, that as I've pointed out in the disclaimer, I'll publish this a long time (~5 Weeks) from now, so things might be better then.