Sprints: Running at maximum effort. Races: By their very nature, these are run at 100% effort. Strides and hill sprints: Performed at 95-100% of maximum speed. Heavy weightlifting: The focus was on strength and power, not endurance or muscle growth. Long runs: Two hours or more of running, which has similar effects to running very fast. Plyometrics and drills: These included power-focused skips, bounds, and jumps. Hill workouts: Running uphill at various speeds against gravity.