I think it’s totally normal. It’s just because your abs are not strong enough yet, so the rest of your body tends to compensate for it. It does the same for me, though maybe not as much as you said. But I think it’s still perfectly normal! Just keep going and one day you’ll notice that you arch less. Also, I think everyone has a space between the floor and their back when they’re lying, depending on your butt’s form :)
Research shows the average American eats about 20 teaspoons of sugar daily, often hidden in processed foods, including “healthy” ones such as yogurt, frozen dinners, sauces, and salad dressings. Twenty teaspoons adds up to 325 empty calories a day, and insulin production increases with sugar intake, which can slow your metabolism, making it harder to burn those empty calories. Read labels and try to reduce your intake as much as possible.
Snacks are an important part of your weight-reducing diet because they provide a boost of energy in the midafternoon and aid in hunger control. A healthy snack option might include a small orange with 1 ounce of mozzarella cheese, a container of fat-free yogurt with 3/4 cup of blueberries, or six whole-grain crackers with 1 teaspoon of peanut butter. Each snack option contains about 150 calories.
Great book, very easy to read, got done with it within 2 days. The recipes seem easy and the ingredients are reasonably priced, even for organic produce. Haven't actually tasted the recipes yet, will try them this weekend, but the quick hacks have been easy to incorporate, and it's nice that he gives brand names, so it's easy to shop for. The different chapters really make sense regarding their topics ( good "bugs": what they do, and how to help them help you). I also liked the quick list of what you should always buy organic and the list for OK non-organic produce. Looking forward to trying the recipes.

In this book, we look at all of the ways you can improve your own gut health, starting with the food you eat. My diet recommendations, meal plans, and recipes will help feed and protect your gut microbes. And we look at the many other steps you can take to support your beneficial bacteria, from avoiding unnecessary antibiotics to changing the way you think about dirt and germs. Even the choices you make about how you bring your children into the world can have an impact on your family’s microbiomes.