The phrase "standard bench press" refers to a popular exercise used to strengthen the chest and arm muscles. It involves lying down on a weightlifting bench and pushing a barbell upwards and downwards using both hands. Full definition
They are bench presses except with a much narrower grip than what you're used to with standard bench presses. (bodybuildingforyou.com)
The underhand grip takes the pressure off the shoulders while hitting your pecs to an even greater degree than standard bench presses allow. (fitnessandpower.com)
It's done by lying on your back on the floor, grabbing the barbell and pressing it upwards, the same as you would do in a standard bench press. (fitnessandpower.com)