The most used four-letter word in any sport, CORE.
Your core and your abdominals are two closely related but very different muscle groups. The abdominals contribute to stability, control and endurance but your core will ensure you maintain all this and the correct posture, avoiding the injury and inefficiency that are often created by instability.
I could throw out a few scientific names now to really define core. Instead I will tell you that your core is made ...