![]() This is due to the lack of oxygen actually needed to perform that level of intensity for that duration. Have you ever noticed how a sprinter can blast their way down the track in less than 10 seconds and not be out of breath immediately after the race? Give them another 10 seconds and the breathing rate increases and they become short of breath. A very high-intensity example is a 100-meter sprinter. The reason the little engine is able to provide power for these two different types of activities is due to the lack of oxygen required for both. This ‘little engine’ can also provide enough fuel for almost unlimited amounts of very low-intensity activity like incidental daily activities crossing the street, climbing in and out of a car etc. ![]() The first engine is a small engine which can only provide enough power to sustain about 20 seconds of very high-intensity activity, like sprinting. The analogy I use is to imagine the body has two engines which provide us with power for exercise. There are basically two conditions the body operates in (in relation to fitness), with oxygen or without oxygen. ![]() The Beep Test – Understanding Aerobic & Anaerobic Systems
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