Marathons are hard because of the physical pain, the pounding on the muscles, joints, tendons.

Marathons are hard because of the physical pain, the pounding on the muscles, joints, tendons.

马拉松是艰苦的，因为身体的疼痛，对肌肉，关节，肌腱的冲击。

-- Lance Armstrong 阿姆斯特朗