Ten Worst Exercise Mistakes 4 By Dr. Nick Campos On April 10, 2010 · Add Comment · In Uncategorized Abs are endurance muscles, not muscles of mass like gluts or pecs—adding weight for resistance can lead to injury. Think reps not plates: Wrong! Adding weight for resistance during crunches can lead to injury. Right! As endurance muscles, reps will get you farther than weight when it comes to abs. Burn ’em baby! Next Please follow and like us: