it all depends... notice how there's multiple things being said in this thread? it's not a 100% science. if you want to body build, then it might make a difference in the order, but otherwise it really won't. weight lifting and running work on different energy systems, so as long as your not running a marathon before lifting, it really won't matter energywise (any tireness trying to lift after running will be more mental exhaustion then actual physical fatigue). the one caveat is that if you're gonna do your legs, i'd say don't run that day.
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Originally Posted by Seaver
To burn fat it really doesnt matter which one you do first. The amount of calories you burn depend on the amount of activity over a given time period. Though do keep in mind you have to work out for about 30 min before you even start using your fat reserve, so at the 30 min mark is when you should start counting your true workout time.
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this is a big misconception... at rest, you're body mainly burns fats... sleeping, almost only fat... the amount of fat/carb you burn while exercising is based on intensity rather than time (that is until you burn all the free carbohydrate in your system at which point only fat is left to use for fuel). the harder you work, the higher % of that energy is coming from carbs compared to a lower intensity. but while you may burn more fat at a lower intensity, you burn less calories over all. depending on how hard you work and for how long, not only could you burn more calories overall, but you could burn more fat at the higher intensity in less time than you would have at a lower intensity.