Should I be training the triple extension swing?
The triple extension swing is an interesting drill to get feedback on your balance and timing during swings.
Elevate your toes on a 2x6, weight plates, the edge of lifting platform or similar stable surface. On the back swing allow your heels to touch the ground and on the upswing rise up on your toes. If your balance is even, you can do this smoothly. If you shift your weight too much between your heel and toe, you will feel pulled backward at the bottom and forward at the top. Start with a light weight until you get the feel for it.
One thing I strive for during KB ballistics is keeping my weight balanced evenly throughout each rep from heel to toe and side to side.
I find that when I stay evenly balanced, I feel more solidly rooted, smoother, more fluid and more powerful. We teach people to "sit back" into the hinge, and often cue weight toward the heels to facilitate a good hinge and avoid being pulled forward, so I think a lot of people
don't actually stay evenly balanced (because they're not necessarily trying to). This may be more of a personal preference than a problem, but aesthetically, I like the idea of rooting through the whole foot.
So the triple extension swing can very instructive and self-correcting when it comes to balance and timing, but I don't really see a role for it in regular training.