The Teeter-Totter Bridge

 Goal(s) :

Have the horse cross the teeter-totter bridge.

 Process :

The horse must enter and exit the teeter-totter bridge.
If the horse has difficulties, allow it to investigate and sniff the obstacle; reward generously when it places a hoof on the bridge.

 Difficulties :

The horse must enter and exit the obstacle without stepping sideways and remain calm throughout.