I'm not sure if I even still get it. What kind of belt would fit around a bag and allow you to tie off 3" from your jab? I don't think I'm dumb, but some days...maybe just thick.

Now for posture...how does it help? Is it to maintain center of gravity for close infighting? Does it help promote proper foot distance when punching and moving?

It would limit you I would think in one way, wouldn't it...say for circling and lateral movement, and in and out practice? I need more info. I think on this one to get it...because I am interested in trying it.

p.s. I understand how this would negate the weight of bag issues.