aspect of Lydiard's training was the primary factor in his success as a world-beating middle distance athlete. The Lydiard system has been challenged since it was formalised and crystallised in the early 1960s. The two main sources of criticism of Lydiard emanate from the English coach, Frank Horwill, and the US coach, Jack Daniels. Horwill's Five Tier Training system departs from Lydiard in its claim that the maximum amount of weekly mileage that an athlete requires to achieve maximum aerobic efficiency is 110 km. Horwill takes the view that Lydiard's insistence on 160 km a week in the base phase is at best superfluous, at worst an unnecessary cause of injuries and staleness. Horwill also differs from Lydiard in that he believes that all aspects of training must be present in a training programme at any time of the year and periodisation is a matter of simply emphasising one aspect of training such as speed or strength during a particular phase in which all the other training components are present. Daniels, on the other hand, emphasises the need to train at what he terms threshold pace in order to achieve optimum athletic performance. He believes that the Lydiard system ignores training at such intermediate paces between the extremes of long, slow, distance running and fast, anaerobic, track work. Legacy Nearly every successful athletics coach or athlete active in the world today consciously or unconsciously emulates Lydiard's training system by laying an endurance base and making use of periodisation for peak performance. While the direct influence Lydiard exerted on the East African athletes is a matter for debate, what is indisputable is that the Kenyan and Ethiopian athletes do significant amounts of endurance work and make use of periodisation. Efforts have been made across the world to preserve and promote the training and coaching legacy left by Lydiard. In his native New Zealand, the Legend marathon, which follows the famous training route followed by Lydiard's greatest athletes over the Waitekere Ranges west of Auckland, was established in his memory by Zimbabwean-born Ian Winson. In the United States, where Lydiard's ideas gained most currency worldwide, the Lydiard Foundation was established by two Lydiard disciples, Nobby Hashizume and New Zealand 1992 Olympic women's marathon bronze medalist Lorraine Moller, to promote Lydiard's training philosophy. In Johannesburg, South Africa, one of the few athletics clubs in the world to be named after a coach, the