David.
If you aren’t shooting for min standards and can exceed those. You should be in good shape for Kokoro.
Suggest you do run and ruck with load 2 – 3 times a week total. 25# ruck 5 -10 miles. Run 5 – 10 miles as well.
Durability comes in many forms.
Make sure you are eating well, bulk up a bit, stay hydrated etc.
We suggest you taper a bit a couple days before to ensure your body is ready.
HOOYAH!