Aqua Training has a cool line of training bags that are water-filled. Filling them with water instead of all the other nonsense they use in other bags gives you more stability and a more realistic training target. The Bruiser Bag is their man-sized trainer that lets you swing on a realistically styled bag. If the movement is too much, you can order the stabilizer package, but remember, no one stands there in real life and lets you hit them. The Aqua Bruiser Bag costs $199 and comes with what you need to get swinging. It simulates a 6 ft. 1 in. person and weighs 160 lbs when full.