Wrap your hands and put on bag gloves before you start.

Stand about an arm's length from the bag in a staggered stance, lead foot forward and rear foot back (swap sides if you're left-handed), knees slightly bent and hands up guarding your chin.

Drive off your rear foot, pivoting on the ball of it so your rear heel turns out, and rotate your hips and shoulders toward the bag.

Throw your rear hand straight out from your chin, rotating your fist palm-down, and hit the bag with your first two knuckles.

Keep your lead hand up to guard your face, then pivot back and return to your stance. Repeat, then switch sides if you want to train both.