This is my punching bag, originally seen in the DC Police Academy bundle. Different texture included to product here. Mesh, Texture, and Animations all done by me.

This furniture item comes with two standing spots. The first is for all the boxing animations, which triggers the bag's animations. The second spot is near the bag and the wall the rack is "attached" to. Now whenever the avatar changes to other spots in the room, the bag will continue to move. (Kinda silly to watch sometimes.) The bag loses synchronicity with the boxer if you return to the boxing spot or change any item you are wearing (on or off).

This is what the second standing spot is for. By moving to it, the bag changes to a soft swinging animation and stops. Now the bag is "reset" and moving back to the boxing spot will have the avatar and bag synchronized. Or moving to another spot will leave the bag motionless. If someone is standing on the "sync spot" while you are boxing, you'll not get to re-sync the animation until the other avatar moves off the spot and someone stands on the sync spot again.