What is “flexigidity” and how has it ensured Jewish survival and identity? Using the concept of flexigidity—the combined effects of both flexibility and rigidity–Gidi Grinstein asserts that what has sustained the Jewish people for centuries is an ability to evolve within their current environment (flexibility) while simultaneously maintaining a solid core of values from which they don’t veer (rigidity). By maintaining a healthy dynamic between these two extremes, flexigidity will ensure Jewish survival, security and prosperity in the future.