According to Vince, “The serratus magnus muscles are the jewel-like muscles of your chest – they add width to the chest, shape, muscular definition – as well as classic beauty. Without well-defined seratus you will never make it in IFBB competition.”
The best exercise for isolating the serratus magnus, according to Vince Gironda, is to hang a heavy weight around the waist and perform the top or round back contracted position of the dip.
Without well-defined serratus you will never make it in IFBB competition.Vince Gironda
You must use a weight that is too heavy to dip with.
Step up on a box for the top part of the dip and lower yourself. Use a thirty two inch wide grip and perform after pec work.