Front Twist. When in doubt select a property and scrub it to see what it does.

joe,

After you perform the attach to motion path you will have a creation node containing the twist property. With the timeline at frame one, right click on the twist property in the channel box...

For a non-dynamic solution you can use animate>motion path>attach to motion path in conjunction with animate>create animation snapshot

1. make a torus and shape it like a link
2. make a curve as...