Depression is probably the best answer. They can all make you emotionally sick, but depression is by far the worst, as I’ve struggled with it my whole life
It depends on the person how much exercise is needed to keep weight off. however, 60 minutes of exercise is an appropriate standard for everyone to keep them healthy
No, this does not cause any severe problems, despite the unsettling sound. The "crack" you hear is simply the joints releasing built-up gas. It is not bad for your health.