focused on hill repeats, a speedwork period, a racing peak, and finally a recovery period before you start all over. No training system is more widely accepted. But critics say that all key training elements can be woven into a one- or two-week cycle
, not distance When you train by time, you don't have to measure a route, and you aren't "penalised" for wind, hills, or trails. (Whether you run six miles on hilly trails or eight miles on flat roads, if they each take you an hour and your effort is the same
