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  1. #1
    Registered User matjusm's Avatar
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    Peck deck machine vs dumbbell flies

    I know that in the vast majority of cases (if not almost all) freeweights are superior to machines.

    However what got me thinking was the Peck deck machine: it keeps the tension on your pecs equal throughout the whole range of motion while as if you were to do dumbbell flies, then the tension would decrease substantially when the dumbbells are raised over you.

    I was wondering perhaps this is one place where a machine can be considered a bit better than freeweights due to the constant pressure? Or is that constant pressure not important for proper muscle development and having maximum pressure at only one part of your range of motion will suffice?

    Any thoughts on this?
    Last edited by matjusm; 05-12-2009 at 02:40 PM.
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  2. #2
    Bulk it and HULK it hulkinout's Avatar
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    I likedoing 1-arm flies on the pec deck fly because you can go past the center of your chest for a much stronger contraction than you can get with dumbbells. Really burns the inner pec line, good for bringing out detail there.

    I like using dumbbell flies best for the stretch you get at the end of the negative stroke. Nothing beats that for bringing out the outer edges of the pecs.

    So, I like using them both for different purposes.
    Last edited by hulkinout; 05-12-2009 at 02:36 PM.
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  3. #3
    Registered User dantheman999's Avatar
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    Well ya got it backwards on the flys, tension decreases as the weight comes up. The problem on peck deck is the weird angle it puts your arms at, something to do with the shoulder angle and no support can cause injuries. I clearly dont know the technical details so maybe someone else can chime in.

    You may be better of with cable flys if you want the constant tension.
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  4. #4
    Registered User gecko2424's Avatar
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    do both and add in cable flys at various angles.

    My gym has 4 different pec decks + 3 cable stations. That in addition to DB's will hit it from every angle.
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  5. #5
    Registered User wmk75's Avatar
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    Originally Posted by dantheman999 View Post
    "Well ya got it backwards on the flys, tension decreases as the weight comes up"
    Maybe I'm reading it wrong but didn't he say the same thing?
    "while as if you were to do dumbbell flies, then the tension would decrease substantially when the dumbbells are raised over you."
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  6. #6
    My farts don't smell aleeboy's Avatar
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    I like the feeling and burn you get when using the pec dec with some plates on top of the stack. However, if you use proper technique, the DB incline fly is a sensational move and give me a better upper chest workout than the incline bench.

    Cables are great too. I do the low pulley chest flies on these. Excellent exercise if you want to switch from incline DB flies.
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  7. #7
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    cable flys>pec deck
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  8. #8
    Registered User jacpot's Avatar
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    Originally Posted by aleeboy View Post
    However, if you use proper technique, the DB incline fly is a sensational move and give me a better upper chest workout than the incline bench.
    LOL wut?

    How is a fly move giving you better results then a incline press move?
    Fly's might make you more SORE but i doubt it promotes more growth than a press.

    Well for me it don't
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  9. #9
    Just like that!!! brighamw's Avatar
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    Thumbs up

    Use both, switch it up...
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  10. #10
    Registered User ItalynStalyn's Avatar
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    I switch it up...but i like the pec dec alot. You can get the same stretch as you get when using DBs...but it also allows you to get maximum contraction when squeezing and lifting the weight. When using DBs most of the tension on your chest is at the bottom of the movement...you don't get that much contraction at the top/end of the motion. I get a better squeeze with the pec dec.

    As Hulk said...doing one arm at a time gives an even better contraction b/c you can go further across your chest than when doing two arms together
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  11. #11
    Get ripped or die mirin' Westboarder's Avatar
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    Pec decs are inferior to cable flyes. You are not working with the same range of movement and a pec dec is not customizable to its user. With cable flyes you can get much better concentration as long as you are using perfect form.
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  12. #12
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    Originally Posted by hulkinout View Post
    I likedoing 1-arm flies on the pec deck fly because you can go past the center of your chest for a much stronger contraction than you can get with dumbbells. Really burns the inner pec line, good for bringing out detail there.

    I like using dumbbell flies best for the stretch you get at the end of the negative stroke. Nothing beats that for bringing out the outer edges of the pecs.

    So, I like using them both for different purposes.
    this^^^^^^^
    its all about inner and outter for me also
    my opinions are just that, opinions
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  13. #13
    Registered User EPMD's Avatar
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    Originally Posted by Westboarder View Post
    Pec decs are inferior to cable flyes. You are not working with the same range of movement and a pec dec is not customizable to its user. With cable flyes you can get much better concentration as long as you are using perfect form.
    I agree. Cable flys have the range of motion independence that the pec deck lacks, and they have the constant tension that the dumbbell flys lack. If I had to pick one, I'd go with the cable flys.
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  14. #14
    Get ripped or die mirin' Westboarder's Avatar
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    I think a lot of people use pec dec because it is more user friendly to the novice.
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  15. #15
    Registered User ItalynStalyn's Avatar
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    People...at least me...use the pec dec because it's more of a controlled motion and you can focus more on the contraction of the muscle. Yes cables give you more range of motion in the you are able to move outside a linear path of motion...but that also means you have to focus more on ensuring you are keeping perfect form and control...and that may take away from concentrating soley on the squeeze/contraction at the top of the movement.

    Neither is superior to the other...it all depends what works better for you
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  16. #16
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    I like them all. Personally I just keep switching it up to keep the variation high in my workouts. Do pec deck one week, do cable flyes the next, then do dumbbell flyes the following week. Or do more than one of those in a chest day. It's all about what your routine looks like and what you are trying to do with it. Each of these exercises has its benefits but ultimately they all work out your chest well.
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  17. #17
    Get ripped or die mirin' Westboarder's Avatar
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    Originally Posted by ItalynStalyn View Post
    People...at least me...use the pec dec because it's more of a controlled motion and you can focus more on the contraction of the muscle. Yes cables give you more range of motion in the you are able to move outside a linear path of motion...but that also means you have to focus more on ensuring you are keeping perfect form and control...and that may take away from concentrating soley on the squeeze/contraction at the top of the movement.

    Neither is superior to the other...it all depends what works better for you
    I strongly feel that once you achieved proficiency with cables, you can then focus on getting peak contraction every time. All gym equipment starts with a learning phase. And similar to balancing free weights, cable pull-downs require some serious practice.
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