QUOTE(M.Ali @ Jun 27 2013, 04:17 AM)
Well, generally, free weights are better for major complex exercises while machines could be better for isolated exercises.
Machines balance the weight for you, making it less of a complex move. The more the complex the movement is, the more muscle groups are involved. Also, contrary to popular belief, some machines are more dangerous than free weights. They force your body into a stiff, unnatural movement patterns and puts more strain on the joints.
For example, I see people in my gym using Smith Machine to squat all the time. They think it's less dangerous. That could only be true if you DO NOT know the correct technique of squats. While it's true not being afraid of a 100 kg barbel falling on you is nice and all, If you can squat properly in terms of technique AND weight (you can't add 200kg when your limit is 120kg, you gotta be reasonable) then you shouldn't worry about that! I couldn't have explained it better than Mehdi:
10 Reasons Why Squatting In The Smith Machine Sucks
Also, machines are more of a structure work than function. I prefer to have more 'functional' muscles that would help me in sports. Weightlifting/powerlifting plus doing sports can get you a perfect body. Bodybuilding is generally bad for athletes because it can make you stiff, gives you 'structural' muscles that are not that functional and will only slow you down. Here are a couple of good reads:
Machines Or Free Weights: Structure Vs. Function!Also, do not forget people like Arnold Schwarzenegger built all their muscles with nothing but free weights!
This is a quote from a 6-times Mr. Olympia Dorian Yates regarding squatting on smith machine:
"Then, squatting on a Smith machine, I could position my body so it was much more isolated on the quads, less glutes and lower back involvement, didn't have to worry about the balance aspect. Actually my legs improved a lot when I was doing Smith squats, hack squats, leg presses — I could isolate the thighs a lot more. So actually I used the Smith machine quite a bit for squatting."
http://www.t-nation.com/free_online_articl...yates_interviewI'll trust DY compared to Mehdi anytime.
p/s: That 2nd article was written 10 years ago. Technology flies fast these days when Billions USD have been funded for inventing and proving machines for BB.
This post has been edited by alien9: Jun 27 2013, 04:31 AM