Kai does them in various training bits
5:03
[youtube]cDsKn4cGm2w[/youtube]
and I just noticed Lionel does them too
at 5:30
[youtube]Cws-FLBWK4Y[/youtube]
I started doing them after I saw Kai do them and they burn like no other! I had to start with like 10 pounds on each side haha.
Has anyone else incorporated them into their workout?