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.

After doing barbell chest presses, guys felt less ready to train again—even two days later—than after using dumbbells or a machine, meaning they needed an extra day to feel recovered.

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 really tough leg workout, trained men feel weak and tired for about 3 days, but by day 6, they start feeling better than they did before the workout.

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.

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.