I have never seen anything be so hotly debated among gym-goers. It seems like I have been asked this question as often as any I can think of. “What’s better Franny, Free weights, or Machines?” The truth is, both have their advantages. One exercise myth that should immediately be put to rest is that free-weights are best for putting-on “size”, while machines are more for “toning” – This is simply untrue. Muscles don’t know the difference between 50-lbs of iron, or 50-lbs of feathers. They simply respond to imposed demand and workload-intensity – period.
One of the advantages that today’s exercise-machines and cable-contraptions do have over free-weights, is allowing resistance to be applied to a working-muscle through its entire range-of-motion. The best example being the “Pec-dec” (Chest Fly machine) vs Chest-flies performed with two-dumbbells. Additionally, machines do have an advantage for being more time-efficient (pin-selection vs unloading plates) and safety (the weight usually travels on a fixed-plane of movement and rarely requires the use of a “spotter”).
My “Free-weight” friends would probably counter-argue with the fact that it takes more “balance” to bench-press a barbell. The truth is they are correct. In the case of bench-pressing, the shoulder muscles must contract as stabilizers to keep the arms from flailing-about as the primary-muscles – the chest, frontal-delts, and triceps – perform the movement. It also takes many more muscle groups to balance and stabilize the body during a barbell squat, as opposed to a leg-press machine. » Read more: Free Weights Vs Exercise Machines