i'm training in this fashion since earlier this year but i'm a noob so for me it's better to do a workout every 2-4 days instead of just once a week. if you've done weight training for years and can actually damage your muscles enough in one workout that they require a week of recovery then i'm sure once a week is fine but for me the results are currently better with about two workouts per week. i usually have one 20-30min hit resistance workout, then 3-4 days later a sprint 8 training (20min) for legs and cardio, and 2-3 days later resistance training again, followed by sprint 8. during resistance training i do the 5 compound exercises and a few smaller ones until i'm really wasted. so legs are trained every 2-4 days (once with weights and once with sprints). it's the largest muscles and give the highest growth hormone increase. imo it's better to have this hgh stimulation every few days as opposed to just once a week. if i reach a plateau at some point and can't increase weight or time under load anymore i'm going to expand the recovery phase but for now it works very well as described above.