I don't go to work till 9, so I do my cardio in the AM and then 4 days of the week, I lift at night. I did HIIT in the AM on leg day and I was sorely disappointed in my lifts that night. I was running at about 70% of what I was the week previous. I probably should have known better, but obviously wasn't even thinking about it. Just food for thought. carry on.

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Keep your body lean, your blood clean and your mind sharp. -Rollins

so are u saying we should lift before we run???

Well, yes... but the point was more that HIIT should probably be avoided on leg day altogether. I do cardio and lifting far enough away from eachother on the same day that I normally have no problems, but HIIT is a different beast altogether. Although I guess if you're really hardcore, HIIT right after lifting on leg day might give you massive pump, but I don't think I'd have the energy.

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Keep your body lean, your blood clean and your mind sharp. -Rollins