Suspended exercises feel completely different than anything you'll ever do with dumbbells or a barbell. There's more freedom of motion, so instead of keeping the arms in a fixed position as with a bar, you have the ability to bring the arms inward (which is the main function of the pecs), placing your body in a prime mechanical position to maximally recruit the chest.
Dumbbells and cables also allow similar freedom of motion, but the fear of falling on your face with suspended flyes creates a whole lot more tension in your muscles that can't be matched. Try this with the TRX, gymnastic rings, or Blast Straps:
Most lifters will be thrilled that they're able to complete a few reps without falling, making it more likely that focus will remain on proper form and maximizing muscle contraction and less on trying to determine how much weight you can brag about.
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