Their running speed in training was from 8.3 to 15.0 km4h21 .
Athletes were running for 1 -- 25 years , during training , they were running for 2 -- 12 h4wk21 and completing 25 -- 180 km weekly .
Athletes ' running speed in training was from 8.3 to 15.0 km4h21 .
Athletes were running for 1 -- 25 years , during training , they were running for 2 -- 12 h4wk21 and completing 25 -- 180 km weekly .