In all honesty Klosey that site is crap.... Those exercises are not the greatest and I dont see how they are related to any on the job skills besides the suitcase deadlift.
Im currently in the process of becoming a FF, and I find the best training is general strength training, with HIIT cardio and almost like a cross fit type training supplemented on various days.
If your becoming a personal trainer, I assume you can come up with your own program. Based on what I said, but then again thats my opinion of what I think is best and what works best for me.
He who dwells in the shelter of the Most High will rest in the shadow of the Almighty. I will say of the LORD, "He is my refuge and my fortress, my God, in whom I trust." Psalm 91:1-2