Isaac is on point. You have a much larger testosterone output when you squat and deadlift compared to working upper body.
Don't forget to put some work in on your hamstrings. Single leg curls with three second negatives will make that muscle blow up.
Don't forget to put some work in on your hamstrings. Single leg curls with three second negatives will make that muscle blow up.
Reporter: What keeps you awake at night?
General James "Mad Dog" Mattis: Nothing, I keep other people awake at night.
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