Mini-"Manion" Workout

I go back and forth on this all the time. THe problem: its HERO WOD day but I don't have the time to do a 40+ min metcon. The question: Modify the Hero WOD or do something else? I don't like modifying Hero WOD's but I realistically may not have time to get to it for a week or two if I skip an substitue. I've decided for the time being to modify the WOD's and see how that goes.

Mini-"Manion"

4 Rounds For Time:

400m run
135 pound Back Squat 29 Reps:

21:46