Boost self esteem, better body structure
When you flex your muscles you are contracting them. When your muscle fibers gain tension through Actin and Myosin crossbridge cycling they may shorten due to the tension. This is called muscle contraction
A, B, and possibly D. It can be A because her goal is possibly achievable and it's B because it's a very specific goal. It's hard to measure how good someone is at cooking and when they're ready to charge money. It isn't really realistic because she doesn't know how to cook already. Her goal is not time specific.
Work outs such as running, weight lifting and swimming.
True, doing exercise every day or every other day would help relieve stress and make you sleep better.