Objective of the study was to develop and test benefits of a new pre-season physical fitness model for junior middle-distance runners at the excellence stage as complementary to the regular training service. Methods and structure of the study. The pre-season physical fitness model testing experiment was run in November 2019 through April 2020 at "Leader" Children and Youth Olympic Reserve Sport School (CYORSS) in Seversk city (Tomsk Oblast). We sampled the young skilled middle-distance runners (n=24) and split them up into Experimental and Reference Groups (EG, RG) of 12 people each. The group progresses were tested by the pre- versus post-experimental physical fitness tests and verified by the actual competitive accomplishments of the sample for the period. Results and conclusion. The EG training model included nine weekly microcycles including one preconditioning plus eight basic pre-season microcycles. The unspecific/ specific/ speed endurance and explosive strength in the EG was trained by the standard-continuous and alternating-continuous practices, interval runs, competitive conditioning method and static-dynamic training exercises [4]. We used the following special training tools in the above training formats: 30-60min moderate-intensity evenly-paced long runs to keep up the unspecific endurance and post-training rehabilitation capacity; high-intensity runs and fartlek to enhance the aerobic/ anaerobic capacities with the heart rate varying within 130-180 beats/ min; 100-800m uphill runs for the leg muscle strength, both in the evenly-paced and interval run formats; soft-surface (sand/ snow) runs to strengthen the leg muscles and ligaments; jumping workouts; pace-stepping/ rhythmic runs for speed training; short (100m at most) weighted runs with a cart to strengthen the leg muscles and train explosive strength and speed endurance; strength practices with weights for strength endurance; and a range of rehabilitation services including sauna and swimming pool
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