Thinking of adding one to my training at home but im not sure what size/weight bag would do for me. There is a 4ft, 25kg bag for Â£33 but not sure if that is too light or not. Any ideas? It would have to be on a boxing stand too if that matters. Im 6 2", 205lbs. I already jog most days & have a decent multigym, this is just to break it up a bit and get the aggression out.