What is the best way to build upper body strength for a female? Why do guys have more upper body strength than females?

1. Question 1: lift weights
   Question 2: testosterone
2. Definitely weights will help, but also push-ups and chin-ups. Keep working towards gradually using even heavier weights. Males naturally have stronger upper bodies but they are also encouraged to develop those muscles throughout their lives. With women, everyone is so caught up in breast size that they don't consider strengthening their backs, stomachs, and arms. Also, being too buff is considered "manly" by some (which reminds me of women's baseball and how they had to wear skirts just to retain some femininity).
3. Its just a male thing to be honest, its like that with every species, apart from spiders, frogs and ants. Go to your local gym, there will be a whole range of weight machines to choose from to build different muscles like biceps, triceps, chest etc.

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