Are there any exercises that could help my back? My back is very weak. Sometimes, I have trouble sitting on a chair without a back for long. I really need help!

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Felicia has a respiratory infection and has been coughing up a lot of mucus. she knows this means that her respiratory system is working to restore balance by getting rid of the invasive materials from her lungs. how does this happen?

When writing fitness goals we encourage using the smart method. what does s-m-a-r-t stand for? use full sentences to explain what each letter stands for in their goals setting process.