Currently I do 45-50 minutes on treadmill (3.8 mph @ 8%-10%) prior to weights, and I know Dylan does extensive cardio sessions prior to weights as well...I do to really warm up the body, and while I am on the treadmill I map out my workout in my head, and get really good lifts in! I feel better being warmed up and sweating when hitting weights...and no real impact on my strength either.
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