Regarding Cardio. Do most of you do it prior to your weight workout? I usually do mine after but I am so beat I can only last like 20 minutes. And when I do cardio first I struggle with my weight routine. Any advice?
Here is a short answer (hope it helps
):
ATP-CrP--------------Glycolytic---------------Fatty acid oxidation
|-limit weights----sprinting, circuit/interval training-----EPOC-------|
|-----------------------traditional gym cardio, running-------------|
|-anerobic--------------combined--------------aerobic------------|
The excercise energy continum runs from left to right, aneaerobic to aerobic.
In most instances, your best training results are going to come from working left to right because of the tendancy of the body to want to work the path of least resistance (in super simplistic terms you have to deplete one energy system to get to the next).
Weights typically are a left sided activity, once those stores are depleated, your body has to go to the next pool of energy resources, the nature of the activity dictates your bodies ability to transition from one energy store to the next. Cardio (areobic training) in traditional thinking is used for fat-loss because it is a relatively low stress exercise that allows for increased oxygen uptake and fatty acid oxidation for fuel if you do it long enough. But to get to the fat break down you have to burn through the other two systems first. Breaking down fat is an intensive process that body will do if it has to, only if there are not any other readily available sources of fuel. That is why if you do cardio before weights, your loads will drop because you have not allowed for sufficient time for your body to replenish the energy system(s) required to move the weights.
You can leap frog this process by performing very intense interval work at short rest periods based off of
Tabata Intervals (google it) that then induce the
EPOC phenomenon (google that too) that allows for prolonged fat breakdown.
Here's a shorter answer:
If you are beat, after twenty minutes, instead of trying to press on longer, why not go faster?