While it's tougher yes, it's still possible. That lack of energy normal people have is from eating shitty and not moving. Once you break through that for a couple weeks you'll HAVE the energy to keep going and it'll be easier to do. I know I've gotten lethargic and I'm definitely getting more tired and fat. When I moved I had energy to do stuff, even though I never had a ton of time. It's a struggle because when I get home all I want to do is watch something or play a game... which means I have no time to cook. So it's a lot of reheated garbage or eating out, both of which just makes it worse. There are things like crock pots, rice cookers, etc that make cooking for yourself easier.
Anyway, yes she is making it sound like it's easy which for most people it won't be. However she's right in that you have to WANT to do it and commit to get anywhere. It's not impossible, you just have to give a shit.
When you have a full time job, that lack of energy is still there because you use up your reserves at work. I've dropped two pants sizes in the last year (weight is the same because I'm doing intense weight training), but here's a typical day for me:
-Up at 5:45, eat 15g of protien for breakfast
-Lifting from 6 to 6:45am
-Get ready for work, leave at 7:30am
-10am eat a protein bar
-12pm lunch, eat 10-15g of protien
-3pm Snack (string cheese, unsalted nuts, fruit or veggie slices, etc)
-6pm Get home, make dinner for the family (usually chicken, lean beef, or fish)
-7:30-8 (4 times a week) 10 miles on the bike trail near our house
-8:30-? Get food ready for next day's dinner.
Rest of the evening I have to putz around, but after a shower I'm dead. Saturday is my "go nuts and eat as many calories as possible" day to jumpstart my metabolism, so we usually go out to eat pizza, burgers, or whatever.
My kids are teens now so I don't have to do as much for them, but someone with preteens- there's no way you could keep up that schedule. My whole day is dedicated to work, making food, exercise, and preparing. I'm getting excellent results (my wife jokes that I'm trying out for Jersey Shore), but I won't be able to keep this up forever.
The point- keeping in shape is harder than people think.