Note: Episode 20 is using Japanese-English! Great fun today with Yusuke Tanka, elite trail-runner part of team Salomon Japan, running coach and cross-training explorer talking about speed training, why do we need to include it in our training routine and how to train during the winter season, when the trails are not the safest option to train. We will see that there are many ways to maintain our aerobic base while having a great time exploring new sports.