calisthenics: 5 Game‑Changing Myths Debunked for Powerful Strength, Size, and Pain‑Free Progress. Calisthenics can build serious muscle, strength, and athleticism when programmed with progressive overload, smart exercise selection, and measurable benchmarks, despite common myths that it is “only cardio” or “can’t grow legs.” Why these myths persist Confusion usually comes from two places: not realizing