I've been focusing on the EUR/USD for a while, but I'm wondering if even just occasionally watching other charts would be beneficial. I've been thinking that maybe watching the ES and other futures, the indexes, and maybe commodities might teach me different things about the markets which I could apply back to my main instrument (in a similar way that they say the best athletes play a variety before specializing in one). Please note that this is from a mental aspect only. I understand that it increases opportunity, etc. Thanks!