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Nitric Storm Avoid wrapping your thumbs around the bar when doing pull downs and pull ups. Placing your thumb inside of your index finger will allow your workout to focus more on your back muscles. It may feel weird at first, though you will get used to it and it will allow you to work out the correct muscles.A great start to any fitness program can be to develop stronger abs. Sit-ups or crunches can help build your abs. Abs compose your body's core and can help make you more flexible. This can