Hi Anita- Although I didn't - a lot of people break up their cardio and weight training. The plan recommends weight training first, however as the emphasis is to still give priority to muscle building, but everyone does what works for them.
I work out at home and have a very flexible schedule since I own my own business, so if I want to take 2 hours in the middle of the day to workout and then work until midnight, well, that's what I do. (WANT would be a "loose" description of course)
I liked the idea of keeping it together, since you get an extra burn right after weight training. I want to make every second count. plus, I already felt like I was showering and changing clothes ALL the time, so doing it one more time during the day seemed like more time wasted to me. I do like being efficient.
I actually had the most trouble with Weeks 7 & 8 (body was getting tired) and then some challenges going into week 9 (Phase 3). Of course, I had a heavy work load and wasn't sleeping enough- so I recommend you don't rob yourself of that!