Apparently Boling has been posting some stuff to YouTube, including a couple of training videos, one from a month ago, another from a day or so ago:
Grass tempo one day and hill reps the next
3 times broken 400s (250+150) one day and 3 x (300, 2 min rest, 200) the next
Mostly longer reps with hill work and weights, normal sprinter base as far as I can tell. I wish he gave times on the reps. Does anyone know whether he’s running indoors??