The mystery of propulsion has been solved. My hamstrings are oddly developed!
21:23
[subtitled]I knew she was awesome around the hip joints! Beautiful runner's effort is unbelievable!
9:09
Coach Mitsuka is sneaky! You'd be fast if you knew that!!!! [Part 1
27:18
What Rock Climbing Really Does to the Human Body | Your Body On Sport | Daily Mail
8:29
ハムストリングス（もも裏）が硬くてストレッチしずらい意外な原因とは？『硬いもも裏の筋肉を柔らかくする方法もご紹介！』
33:04
【厚底シューズの性能を活かす走り方】市民ランナー必見／ケガなくタイムを上げる３つのトレーニング／後半バテないためにはどうすればいい？【BODY SKILL SET】
12:47
Actually, I didn't need to be conscious of "using my butt". How the buttocks are used in running.
15:48
[Part 2] I see! That's how gravity works!
19:45