I recommend that you do this exercise with dumbbells rather
than a barbell simply because dumbbells allow your wrists and forearms greater freedom of movement to not only find their best path for the exercise but also to increase the stabilizing requirement as you're leaning down onto your forearms.
To put it
simply, compound exercises are movements that use more
than one joint (squats, deadlifts, bench press, shoulder press,
barbell row etc.), contrary to isolation exercises that use only one joint (think leg extensions, bicep curls and triceps extensions)