Tim Stevenson and Jacko from School of Calisthenics discuss the concept and benefits of calisthenics, velocity-based training, progressions in calisthenics, and mastering handstands. They emphasize the importance of range of movement, adaptability, and different training methods. Learn about Flex, a laser-based training system. Find more information about Tim and Jacko, their website, and their podcast on the Performance Digest.