You need to be in the "fat-burning zone" to burn fat
This is just fundamentally untrue.
Your body’s energy requirements operate on an upwardly angled line, more or less. As you move from sitting to walking to jogging to sprinting along the x-axis, your body's energy needs increase along the y-axis. Your body has to break down stored fat and carbohydrates (muscle glycogen and blood glucose) to produce this increased demand for energy.
The thing is, your body doesn't break down just one source of fuel or the other -- it's constantly breaking down a ratio of the two. At lower intensities (say, sitting or walking), your body uses a greater ratio of fat to carbohydrate. Hence the name "fat-burning zone."
As exercise intensity increases, the ratio eventually flip-flops and you start burning a higher ratio of carbohydrates to fats. But since your total energy requirement has continued to rise, you actually burn more total calories and total calories from fats than you would during lower-intensity "fat-burning zone" training. So, for example, if you're burning six calories per minute at a 4:2 fat-to-carb ratio during jogging, you're still burning fewer fat calories than you would at a higher-intensity sprint of 11 calories per minute at a 5:6 fat-to-carb ratio.
Protein supplements are a requirement for muscle growth
PROTEIN is a requirement for muscle growth, but protein SUPPLEMENTS are not. The building blocks of proteins -- amino acids -- are absolutely necessary for muscle protein synthesis and repair after exercise, and protein supplements like protein bars and powders can, of course, provide the necessary amino acids.
But you know what else can provide the necessary amino acids? Real food. Like chicken, tuna, eggs, milk, or vegetarian-friendly sources of protein, such as hemp, pea, or soy products.
I’m not saying there’s no room for supplements, but believing you can’t see results in the gym without supplementation is like believing you can't go to work without stopping at Starbucks. One is not a requirement to successfully complete the other.
Lifting weights while pregnant will hurt the baby
As long as a woman was lifting weights prior to her pregnancy, and as long as her doctor clears her to exercise, there's no reason she can’t continue to train throughout pregnancy. This isn’t the Middle Ages, or even the 1950s. Women aren't dainty flowers, and pregnancy isn't an illness.
In fact, women who prioritize exercise throughout pregnancy have easier labors and recoveries than those who don't. So, uh, yeah, lifting weights while pregnant can actually be a really good thing. Stop treating it like it’s a capital offense.