Maintenance block
For a cut, a heavy lifting block or a busy spell. About half his current running, one hard run a week alternating threshold and VO2 max, the rest easy. No progression: the aim is to hold. 2–3 runs a week is plenty.
Gym sessions and days he can't run
Hard runs avoid the day before and after legs, full-body and HYROX (or other conditioning) sessions. Upper, push and pull days are fine next to hard runs, and easy runs can share any day. Tick "Can't run" for days he has no time to run.