How to do running trebles in Irish dance. Running treble designates a series of trebles alternating right foot and left foot. These can be done going forward or going backward. In order to progress forward with the running treble, the foot lifts up from behind and is placed then in front. We'll start with a series of running trebles going forward on the right side. And... It's important when doing the running treble going forward that the back foot lifts up and tucks behind before it's presented to the front. We'll see that again. To do a running treble going back, the foot goes from the front to the back, or from forward to backward, as this. Here, too, the foot should be lifted when it's in the back position. How to do running trebles in Irish dance.