You are in the gym doing some standing curls (i.e. stand straight up, put your elbows at your side, and lift a weight by rotating your forearms about your elbows up and down) with a 20lb. (88.96N) weight. Your goal is to find the position such that holding the dumbbell in place puts the most strain (i.e., force) on your bicep. (Hint: Your bicep creates an upward force around 4cm from your elbow (the pivot point) when lifting).
First, calculate the force exerted by your bicep when holding the dumbbell in place for multiple positions, then find and justify the position that creates the most strain on your bicep.

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Finding the Bicep Strain Position During Curls To find the position that puts the most strain on your bicep well analyze the forces acting on your arm ... View the full answer