Defensive Blocking. Free Video.
Having been fortunate enough to train in most Combat/Martial Arts systems, I have found that Traditional Karate blocks are the strongest, but admittedly they sometimes need adjusting for sparring/fighting.
In my time, I have combined Shotokan/Shukokia Karate blocks with Boxing/Kickboxing parries and Krav Maga 360 defensives, all with some success.
Each to their own but below is a free 6-minute tutorial on blocking using correct transference of weight and pull back. Enjoy and feel free to share!