I am about 5-9 160lb i have broad shoulders but a small rib cage. I have twpo questions: 1. How can I expand my rib cage or create a wider frame look? 2. When I do lat work such as pull ups or pull downs, I always tire my biceps before I get a strong lat work out, how can this be avoided or are there better excercises for my lats. PS I am mainly concerned with mass at this point as you may have guessed. Thanks.