The whole key to the Viking Day, as apparently the people above haven't read as this is pointed out in the article very clearly is to do heavy, hard shit with little chance of injury. That is why we don't do loaded carries. That's not to say they aren't good, but done for conditioning for an unprepared lifter/athlete reeks of idiocy. Again, this is pointed out in the article about the Viking Day.
Here's what I'd for you - pick some challenging conditioning goal - say 6:00 mile or something similar. And go fight for it. I am amazed at how few people can actually RUN a mile (NOT jog). If you aren't hurt or too old, you have no excuse.
There is no detriment to the man who can run a TRUE 6:00 mile, deadlift/squat 500 and do 20 dead hang chins.