They tested the back squat using a barbell and leg press machine and this is what they found.
Findings:
barbell squats produced significantly higher levels of testosterone and growth hormone. At the greatest difference, which occurred during the workout, testosterone was about 25% higher when performing full squats versus leg press. But the difference in growth hormone was incredible. Squats produced a full 200% more growth hormone during the workout. Even thirty minutes after the workout, participants who did squats still had 100% more growth hormone as when they performed the leg press. Double your growth hormone, double your fun?
CFW conclusion:
Yes machines are better than nothing, but to get the best results you need to work out like Rocky Balboa.
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