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wait, you can run after a lifting session? Won't that be detrimental if you're trying to add muscle?

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He is trying to lean out, not add muscle.
With any type of long distance running, men will lose leg muscle.
Example: you run steady for 20 min. Your body needs proteins and energy to supplement your body to keep moving and not crash. It will start pulling proteins from the main muscle that is moving, the legs......
That is main reason you never see bodybuilders run long distances. They may run in spurts, or do sprints, but never long distance (20 min or more). I haven't run in over 8 years since I began bodybuilding. I just walk. That's enough to target just fat