Anterior Core Strength
If you want to get strong everywhere else it’d be smart to prioritize anterior core strength. The ability to maintain the relationship between the ribcage and pelvis will better allow you to stabilize during all other exercises.
The key is to focus on “Anti-Extension” rather than active flexion. Crunches are more likely to give you back pain than effective core strength. Exercises like planks, rollouts and bodysaws train to resist motion at spinal segments, helping you keep your back healthy and transfer force more efficiently during strength training and performance activities.