Either use a hilly route or do repeats on one hill.
选择一个山路，或者在一个斜坡上反复前行。
Wear comfortable shoes, as it is a hilly city.
穿一双舒服的鞋子，因为这是一座山地城市。
San Francisco is a hilly city.
旧金山是个多山丘的城市。
Slopes: Uniform 2-4% ideal. Hilly is good. Flat is a challenge.
坡度：坡度为2- 4%的连续坡地最佳，山地优于平地，平地的挑战更大。
Slopes: Uniform 2-4% ideal. Hilly is good. Flat is a challenge.
坡度：坡度为2- 4%的连续坡地最佳，山地优于平地，平地的挑战更大。
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