With any exercise, there must be intent behind why and how you are executing it. With selecting assistance movements for strongman, I find it important to checkoff as many boxes off as possible. In the example of the single-arm overhead dumbbell tricep extension, we are looking to accomplish a deep stretch of the tricep and lat while maintaining a neutral body position. We want to enforce similar patterning to the circus dumbbell of keeping the elbow close to the ear which is a sign the dumbbell is more over our center of gravity. Since assistance movements are not the priority of the session it should be noted to aim for quality over quantity as far as form versus load.