Here's why doing standing dumbbell curls alternating between arms can offer superior isolation for the biceps compared to the bilateral approach. When curling both dumbbells simultaneously, people often extend their arms slightly outward from the sides of their bodies to prevent the dumbbells from contacting their legs, unintentionally engaging the lateral deltoids. Alternatively, they may position their arms in front of their bodies unintentionally placing tension on the front deltoids. The alternating dumbbell curl eliminates the engagement of the front and lateral deltoids, because the side lean helps create space for the dumbbell, all while allowing for a vertically straight upper arm aligned with the force of gravity. This ensures that tension is predominantly concentrated on the biceps. For a SIZE & SHRED training program, visit deltabolic.com! (link in bio) #bicep #biceps #bicepcurls #bicepworkout #bicepsworkout #bicepworkouts #alternatingbicepscurls