Dom, you must already be a very good runner if a 100k is within reach. Please share what you know.
Getting a snatch PR didn't translate to a hike/jog PR for me. But, hey, a 10-minute test is not the same as a 30-minute or 4-hour test.
The "Victor" section of Easy Strength was helpful.
Light swings & goblets are a great way to limber up, and compliment jogging.
Good luck with scheduling. Stay healthy.