Why Are Some Bicep Curls Harder?
by SAM PAGE
Sam, I noticed that doing bicep (arm) curls in a seated, incline position on a bench is more difficult than doing them in a standing position. Why is that? -Bob, Silverlake
The reason doing bicep curls from the seated, incline position is more difficult is because it puts your biceps at a less favorable angle and causes more muscle fiber recruitment. In layman’s terms, more stress is placed on the biceps when at a 45 degree angle than from a standing position, where your arms basically hang straight down.
A similar situation is caused when performing chin-ups on a bar versus the traditional pull-up. While both exercises work the back effectively, chin-ups also place an emphasis on your biceps, which makes them easier for many people. Pull-ups, on the other hand, put your biceps at a less favorable angle, making them generally more difficult to perform.