Interesting topic TT. In general, bridging is best defined by the classic poems. "Build a bridge and walk over it."

For Hung Gar, this is a key concept. I don't claim it is the only style to have this concept but it should drive almost all contact. This implies that HG is not a "hit and run" style or a "mainly counter attack" style. If you look at the 12 bridges, it is a model for all connections. Chuen Kiu (inch/short bridging) is just one of the 12.

If you are asking about the one bridge, distinct from the others, then subitai gave a decent example. But training the bridges should not happen in isolation. In abstract, bridging is a connection. Usually discussed when the arms make contact but it actually starts the moment there is any connection. Body position, posture, distance all come into play.

In this sense, you could call short bridging, the moment there is contact. As Subitai has also mentioned in previous posts, our sifu condensed the concept of bridging into one word. "Follow" It doesn't mean keep constant contact but more follow the energy/opportunity. I think a twist on a classic poem applies. "Find the door and walk in"

I like this metaphor because if the door is open, you just walk in. If the door is automated, you must wait for it to open. In some cases, it can close on you (like an elevator door). Some doors require you to open them yourself. For these, some you can open and leave open while others need you to hold them open. Some doors are locked. In this case, you must decide to break the door or find another. If you look at the 12 bridges, they discuss various ways to find and utilize a door. Focusing on one of the bridging concepts is only training for one type of door.

So what were you looking for?