Agile Strength improves our ability to produce force to generate and sustain momentum. Swings, Flows, Parkour, Gymnastics, and Dance all are techniques/strategies that improve our agile strength.
To sustain momentum, the body looks to capture potential energy from our elastic tissues (fascia, skin, ligaments and tendons) which reduces the amount of energy required to accomplish a momentum-based task. Strong, elastic tissues along with proper rhythm and timing are critical for Agile Strength.
Note: At 4:58 mark in the video, should read "Greater Intermuscular Coordination". Also, Traditional Two-handed KB Swings are LLT, not LMT as depicted in the slide.