Tomiki Aikido
The nature of aikido allows it to be readily accessible to practitioners of virtually any age, from students to grandparents. (However, the minimum age to begin must be at least 18 years. To those younger than 18, whose bodies are still in a developmental state of growth, the arm and wrist locks practiced in this art would prove too much of a potential danger.)
The aikido Mr. Lowry teaches contains, just as Mr. Tomiki envisioned, a series of kata as well as the practice of randori (although, unlike common Tomiki-ryu schools, the Kaze Uta Budo Kai approach pursues a non-competitive form of randori). As with judo, randori serves as a method of applying principles learned by repetition of kata.
