Top 10 Bob Punching Dummy
Last update: 12-07-2026
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Bob Punching Dummy: 3 things to consider before buying
Decide whether you want a body-shaped BOB or a plain tube bag
A true BOB is a moulded torso and head, so you can aim for the jaw, nose, ribs and liver the way you would on a person. A cylindrical freestanding bag gives you power and rhythm, but there is nothing anatomical to aim at. Pick the shape that fits what you actually train.
Plan to fill the base with sand, not water
The weighted base is what stops a freestanding dummy sliding or rocking when you hit it hard. Water is easier to pour in and drain. Sand is heavier and steadier, though, so most people end up refilling with it. Budget for that from the start rather than buying sand twice.
Check the height range fits your tallest user
A Century BOB adjusts across roughly 60 to 78 inches, and the BOB XL goes up to about 82 inches, so head and body shots land where you want them. If more than one person will train on it, set it for the tallest of you and adjust between sessions.
Frequently Asked Questions
What is a BOB punching dummy?
Should I fill the base with sand or water?
How much sand does a BOB base hold?
What is the difference between the BOB and the BOB XL?
Is a BOB dummy better than a heavy bag?
Will a freestanding dummy slide or tip over?
Can I use a BOB dummy without gloves?
Do I need to bolt it down or install anything?
How tall is a BOB dummy?
Your complete guide to Bob Punching Dummy
What a BOB dummy is, and who it suits
BOB is short for Body Opponent Bag: a freestanding striking dummy with a moulded human torso and head sitting on a weighted base. That shape is the whole point of it. You have a jaw, nose, ribs and gut to aim at, so you can train accuracy in a way a straight bag never allows. Throw a liver hook at the exact spot under the ribs, or slip an uppercut under the chin. Neither works on a cylindrical bag. The vinyl skin flexes on impact and gives feedback close to hitting a real opponent, and it takes punches, kicks, knees and elbows with or without gloves. If your focus is self-defence, boxing accuracy or realistic target practice at home, a BOB earns its place. If you mainly want to build raw power and timing on a swinging target, a hanging heavy bag will probably suit you better.
Base stability: the thing that makes or breaks it
Every freestanding dummy lives or dies by its base. One that slides across the floor or rocks back after each shot ruins the session, and the cheaper bags can tip over when a grown adult hits them hard. Two systems are common. Weighted bases fill with water or sand, and suction-cup bases grip the floor. Suction cups only work on smooth tile, marble or wood. On carpet or uneven flooring they do nothing, so check what you are standing on before you rely on them. For a heavier BOB the fill matters most. Sand is denser than water and holds the unit far more steadily, which is why it is the better choice if you punch and kick with real intent.
How much to fill, in practical numbers
Filling is where you either get a rock-solid dummy or a permanent wobble. A full-size Century BOB base takes about 250lbs of water, and the same volume in sand comes to roughly 360lbs, which is exactly why sand feels so much steadier. The BOB XL base holds up to around 270lbs of either. Fill in stages. Stop every three or four minutes, test the wobble, then top up until it stays put. If you are lighter, or training children, filling halfway can be plenty. Sand bought in bags is worth drying in the sun for a day before it goes in, so it flows and settles properly instead of clumping.
Size, height and which BOB model
Century make more than one BOB, and the right one comes down to your height, your space and what you train. The original adjusts across seven heights, from about 60 to 78 inches. The XL has a longer torso, so there is more surface for body shots and kicks, and it extends up to around 82 inches. A taller torso helps if you drill body work and low kicks, or if taller people will share it. Fully filled, the classic BOB comes in around 122kg, and the XL is heavier still. Decide where it will live before you buy. Once the base is loaded you will not want to shift it often.
Material and durability
The striking feel of a BOB comes from its build. The body is high-strength plastisol over furniture-grade foam, soft enough that it does not hurt bare hands or feet, yet built to take years of hard strikes. On any freestanding bag, the high-density foam filling is what holds the shape and absorbs shock over time, so check the filling rather than just the outer cover. A cheaper bag with loose, low-density stuffing packs down and loses its feel far sooner than the spec sheet suggests.
