As an endurance athlete, you want to be building local muscular endurance and full body stability - exercise choice depends on what your sport is. (completehumanperformance.com)
You can use this upper body stability progression with any upper body exercise to increase core muscle work. (ab-core-and-stomach-exercises.com)
When this happens, the total spinal structure is thrown off and, consequently, the whole body stability. (onnit.com)