A freestanding bag removes every excuse about space, drilling and ceiling beams. This one stands on a 19 in base you fill with up to 70.5 lbs of sand or 28 L of water, so the 11 lb frame plants itself on the floor and takes a punch without being bolted to anything. Six suction cups underneath grip tile, wood or concrete, which keeps the base from skating across the room when the combinations get quick.The striking surface is an integrated Pu boxing ball, 7 in wide and mounted on a high-quality spring that returns fast enough to train timing as well as power. Height locks at 55, 57.5, 59 or 62 in, so a teenager, a shorter adult and a taller one can all work at the right line during the same evening. Breathable gloves come in the box to protect hands from the first round. When the session ends, drain the base, set it on top of the bag and slide the whole thing into a closet, or carry it by the side handle to wherever the next workout happens, whether that is fitness, technique practice or a quick stress-relief round after work.