For one of my classes we are delving into nutrition and physical fitness. During one of the discussions I remembered a fact that I'd been told many times by friends who are also personal trainers (I have a lot of them because I worked at a gym for 5 years). WEIGHTS BEFORE CARDIO. I never questioned why, I just always followed it. Because I was going to post the trainers' sage advice I figured I should figure out why exactly weights then cardio and not the other way around. What I found was pretty amazing.
When you do any kind of anaerobic exercise(such as weight lifting) your body burns glycogen (or stored carbohydrates). You wont burn fat until you've depleted your glycogen stores, which takes 29 minutes of cardio to do. The catch is that your body needs the glycogen for the weight lifting. Anaerobic activity will not usually go for fat once the glycogen is gone, it breaks down muscle instead and burns the amino acids for energy. So, if you do 30 minutes of cardio first(depleting your stored glycogen) you will most likely be destroying muscle instead of building it during your weight lifting. However, if you hit the weights first you will spend more time in your cardio work out burning actual fat!
wow, exciting! (more here)



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