A "heavy barbell" refers to a weightlifting tool that is very heavy. It usually consists of a long metal bar with weights attached at each end. Full definition
However, leg training isn't only about heavy barbell squats and leg presses. (fitnessandpower.com)
When you are performing heavy barbell rows, you must incorporate momentum and it becomes easy for the ego to get in the way. (getthisstrength.com)
While it will never replace, heavy barbell bench pressing the dumbbell bench press is a good additional exercise to add to your routines. (fitnesscrest.com)