Avoid wasting your energy on small muscle groups, curls and similar exercises take time and effort away from the big moves that will provide the biggest gains in strength and size. (homefitnessguru.net)
Small muscle groups such as the biceps are easy to over train since they are involved in almost every exercise in the gym. (fitnesswayne.com)
These skills are made with the whole body as opposed to fine motor skills that are made with smaller muscle groups. (littleremedies.com)