Hypoxic Advice/Workouts--Not Your opinion of Hypox Efficacy

Discusing Hypoxic sets with a freind, can anyone suggest a good hypoxic set for me. I'm doing 3500-4000 3x a week and a short sprint workout on the weekend. I will not likely add another day to my schedule. What's a good starting workout, and also where in my workout should I do this? Do you mix it up e.g. hard interval set then a hypox or hypox and then a pace set. I am guessing mixing is a good thing but what's a good start point for a set and intervals for this? BR and FR being my stronger strokes.