Father Jacek Stryczek (in red), who is widely known in Poland, boxed last weekend against Andrzej Supron (64), an Olympic silver medal winner. The fight ended in a draw. It took place during the fourth "Business Boxing Poland Gala" in Warsaw. Managers and businessmen boxed for a good cause against professionals. Stryczek is chairman of the charitable foundation "Wiosna" (meaning, “spring”), which received the proceeds of the evening.
The event was to benefit charity and included some high profile (managers and businessmen) individuals. It wasn't a serious contest. Because of that, I'd say it's ok for the priest to participate. Whether or not the Olympian knocked a little sense into Father Jacek is debatable.
I don't like stuff like this. Instead shouldn't the priest be saying Holy Mass to box the Devil and not spending his time trying to knock out a fellow Child of God.