The 2 optional exercise slots should be used to address the specific and unique needs of the individual athlete — perhaps it's core control for one athlete or power development for another. (blog.trainheroic.com)
Because bearing down is the easiest way to «cheat» as a way to gain core control, avoid programming core - intensive exercises that are beyond your client's current ability level. (coreexercisesolutions.com)
This will make your body into one functional (fighting) unit, giving better core control and balance. (homefitnessguru.net)