Q&A for How to Build Upper Body Strength

Yes, they do. They also help your arms.

Doctors suggest an hour per day for exercise. That could be spread out throughout the day - you could do 30 minutes in the morning and 30 minutes at night, 20 minutes in the morning and 40 minutes in the afternoon, etc.

Climbing a rope mostly taxes your arms, back and grip strength. Exercises that focus on pulling motions such as pull ups, inverted rows, bent-over rows and just about anything else called a "row" should help. Using a heavy weight should work your grip too, but it might be worth using extra grip strength tools.

Yes, any sort of exercise burns calories and will assist with losing weight. however weight loss won't happen unless you are in a calorie deficit (average person in the ballpark of 2000-2500, but you can find calculators for this online.)