When trained men do different types of chest presses—using a machine, barbell, or dumbbells—their chest muscles and shoulder strength bounce back at about the same rate after a tough workout, no matter how stable the equipment is.

After a tough chest workout, your ability to push your arm across your chest comes back fully within three days, no matter if you used a machine, barbell, or dumbbells.

After doing a barbell chest workout, guys felt way more tired and less recovered than after using dumbbells or a machine—even two days later—suggesting barbells leave you feeling more drained.

No matter which chest press they used, the guys completed almost exactly the same number of reps in every set—showing they pushed just as hard regardless of equipment.

How much total weight you lift matters more for muscle damage than whether you use a barbell or dumbbells—even if one feels harder or heavier per rep.

Your chest muscles swell the same amount after a hard workout whether you use a machine, barbell, or dumbbells—so the muscle-building stress is about the same.