I am putting together a trend trading strategy and one thing i see mentioned every so often is along the lines of: "if i put on a trade, and it doesn't go up then i get out"...I am not talking about hitting a SL but rather just not going up like you anticipated. I am curious as to the reasoning behind exiting a position solely because it is slower to react than you had predicted. I understand the motivation for this with something like options contracts where Theta is slowly eating away but what other reasons? Simply to put your capital into something more active? You are proven wrong in your timing based on the sideways movement? How long do you give a trade to make upwards movement before exiting? thanks. p.s. please comment with your opinion no matter what particular trading style/duration you employ.