Sorry! I thought your question was more about if the site would let you start over from a technical perspective. :)
You can definitely do TBT over again if the first time through you were doing modifications or needing to take some breaks. Until you really think the workout is getting fairly easy, you can push and still get gains. And if you're just looking to maintain, it will work for that as well.
If TBT got pretty easy for you, or if you want a change, Inferno is a good one to keep up a strong body. It does have more high impact movements than TBT, but it's a great workout.
All of the programs actually automatically restart once you've finished the last workout. You would have to change programs in order to see something *other* than TBT.
Obviously doing something is much better than doing nothing, and if Cardio Sculpt motivates you, it's better than nothing. But like others have said, doing it too much will make it less effective, and it's best for your body to use a variety of muscles and have workouts with varied pace for your cardiovascular health.
If you haven't progressed this far in the Cardio Sculpt program yet, maybe try Box & Burn, Blast n Burn, Cardio Ball, and Cardio Sports Drills. I loved Cardio Sculpt and also loved those when I got to them.
I've read before that DB uses an algorithm of your age, weight, gender, and the level of workout intensity you entered to estimate calories burned, but I have to say that after getting a heart rate monitor, the calorie counts between DB and my HRM are WAY different.
I think one of the biggest factors is your cardiovascular health, since how hard your heart is pounding, how long you stay in each zone, and how quickly your heart rate comes back down will play a big part in how many calories you burn. For me personally, I did a workout yesterday that said I burned 619 calories, but my HRM said 297.
If you're really trying to use the calorie estimate to help with net caloric intake, I'd recommend erring on the side of DB being a little too generous with the counts.
I just want to add my support for you as well. I have lost 90 lbs in the past 13 months, and even just three or so months ago, I would be mortified that when I would do tuck jumps or sometimes jumping jacks, I could hear my pouch of belly fat slapping against my body. But I just kept going and thought about how that's the reason I was sweating and jumping up and down to begin with. Now it happens extremely infrequently (I still have some fat to lose despite the weight loss) and I know from my experience that it WILL go away. I am shocked at the things I can do now - plyometric lunges, jump squats, etc that I never, ever, in a million years thought I would be capable of. If you stick with it, I know you will get there, too.
And as for those quiet instructors, remember that professionals have edited the sound in these videos. If you watch some other, independent workout videos online, you'll hear the trainer's feet hitting the ground when s/he jumps or runs.
GalacticHero gave you some good tools and reads for understanding this, but I'll also just put my 2 cents in. I changed my diet and exercise habits 13 months ago and have noticed over that time definite patterns in my weigh-ins since I record them (along with food and exercise). I have consistently weighed myself twice a week - Wednesdays and Saturdays - at the same time with the same conditions and can tell when my weight is affected by water retention. If I have a meal with more sodium, I will weigh up to 2 lbs more than if I avoid it. My "trick" is to eat a low-sodium diet the day before I weigh myself and if possible, also avoid meals with a lot of hard-to-digest foods. Then I'm retaining less for my weigh-in. I can immediately tell when I wake up how my weigh-in will go, though, by whether my stomach is bloated, and I prepare myself for it.
I'm sure as you continue losing weight, you'll start to see your own patterns with food choices and even monthly weight fluctuations. It will even out over time and like GalacticHero said, it's better to pay attention to the long-term and the trend and not let the intermediate "gains" get you down (even though I struggle with that, too)!
So first, I'll say the usual caveat that I'm not a doctor and of course if you're concerned, the best way to make sure nothing is wrong is to see one. But in my amateur experience, I'd say a couple of things.
First, it is completely normal to lose weight quickly when you first make big lifestyle changes like exercising regularly and drastically altering your diet. (Especially when you do those at the same time.) How quickly people lose weight also depends quite a bit on how much they weigh. People with more extra weight lose it more quickly than those with fewer extra pounds.
Second, you said you might have over-estimated your starting weight. If you aren't or weren't using the same scale, or if you just guessed your starting weight, then of course it's possible there were some discrepancies.
I'd also recommend that in addition to weighing yourself, you take regular measurements since I'm sure you'll start to level off on your weight loss and might even go through periods where you'll plateau or even gain a couple of pounds due to gaining muscle, and having measurements can help you see that you'll probably be toning up and getting smaller, even if the scale isn't budging, which can help you keep from getting discouraged.
All that aside, kudos for making such big changes for your health, and stick with it! It is totally worth it.
Sure! To change the age and fitness level, go to the upper right-hand corner of any page where your picture and username are, and click on the down arrow. Click the first option - My Profile. Now click the yellow "Edit Profile" button that shows up under your picture on that new page. Then, on the next new page, on the right-hand side, three boxes down, there is a box that says "Customize your DailyBurn". Click the hyperlink in that box for "answers to the Dailyburn questionnaire". Then you're finally at the page where you can update those!
What I've read about this in the past is that DB uses an algorithm to determine calories burned based upon gender, age, the weight you enter, and what fitness level you have entered - either when you first signed up or by adjusting that in your profile (beginner, intermediate, advanced). Of course the best way to get an accurate count is to use some sort of heart rate monitor since each person's physical health also impacts how many calories you burn during a workout.
I also did Cardio Sculpt after I finished True Beginner and found that it was a good progression. I was worried at that time that I wouldn't be able to keep up with Cardio Sculpt, but they have different levels of difficulty (modifiers) for almost every move, so it was no problem.
I did Total Cardio after I finished Cardio Sculpt, and by that time I could do it, but like swimjim said, I think it would have been way too hard if I'd tried it after True Beginner since I was probably too heavy and not strong enough at that point.
I've also seen that Justin says it's okay to go back and do True Beginner a second time if you start Cardio Sculpt and are struggling. But I think you'll be fine! Good luck!
You said you've tried a number of sites, so I apologize if you've already tried this one, but I use myfitnesspal.com (which also has an app for different platforms so you can take it on the go). When you create an account (it's free of charge with no hidden add-ons), you enter your current weight and your goal - lose weight at certain amounts per week, maintain weight, gain weight, etc. - and your base activity level. It then calculates for you how many calories you should have each day to meet your goal and measures your progress each day toward that number as you enter your foods and exercise.
What could help in regard to your carb intake question is that it doesn't just measure and give targets for calories - it also measures carbs, sugars, fats, protein, sodium, and if you adjust settings, you can see even more. It uses a basic target percentage of daily intake for those categories and gives you the number you should be consuming for your goal, and you could also adjust that to target different percentages. It's a great way to keep track of each category and balance your diet. Like tbell072 said, you would be able to see those hidden carbs and not let them get you off track.
I hope that might help as an option for you to look into.
From what I understand, Intelliburn supposedly uses some sort of algorithm to determine what each day's workout will be, partly by assessing the previous day's workout, so it cannot have a pre-planned calendar like the other programs do.
I'm doing Intelliburn now after having done several other programs, and I have to admit I'm not a huge fan of not being able to see what my workout schedule will be. Even a week at a time would be good.
I agree 100% with what GalacticHero said, and I'd also add that as you start a new exercise program, you'll need to keep in mind that if this is new for your body, you're going to be building muscle along with losing fat. So you may see that you're getting slimmer and more toned (along with all of the other great benefits like better cardiovascular heath, mobility, flexibility, and balance), but your scale may not change as much as you'd like at times. From personal experience, I'd say it would be a good idea to take measurements as well as weigh yourself. You might experience a quick weight loss in the first month and then see yourself toning more than losing for a while.
As far as losing 40lbs in a year, I think it's absolutely possible. Yesterday I had my one-year "anniversary" of starting my weight loss journey, and I've lost 86lbs. You can definitely reach your goal with determination!
How many calories you'd burn during each exercise depends a lot upon your weight, age, which level of difficulty you're doing during the workout, and how in shape you already are. The site gives you an estimated calories burned during and after each workout based upon the information you provided when you signed up and as you update your weight, so you would know approximately how many calories you've burned, even without the heart rate monitor.
Cardio Sculpt is a great program for someone who doesn't need True Beginner but isn't already basically an athlete like Inferno requires, but there are many programs in Cardio Sculpt that are longer than 30 minutes (more like 35-45 and one is 50).
You could always use Discover, filter the workouts by Difficulty Level (on the right-hand side), and then you can see each Intermediate workout and how long it is. It's not a program that way, but it may fit your time needs and difficulty level better, and it would include the 15-minute workouts in the results as well.
Good luck! I bet you'll find Daily Burn is going to keep you coming back!