Pummeling is a stand-up drill used by wrestlers to get familiar with the motion of continuously swimming inside for positional control in order to set up throws and takedowns. To practice pummeling, grab a partner and get the overhook and underhook on each hand. Each partner must swim inside their overhooking arm to get an underhook while bumping each other chest to chest. Pummeling can be done as a warmup or a cooldown exercise after every training session.
How good are your standup skills in Jiu-Jitsu? Yeah, they could probably use some improvements.
For example, you should regularly drill Tachiwaza Pummelling.
Roy Dean explains and demonstrates Tachiwaza Pummeling on the video below: