Step 4: Challenge negative or inaccurate thinking.
第四步：挑战消极和错误的想法。
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。
The part 4 reviews the challenge brought by Schmitt.
第四章节综述施米特带来的挑战。
The part 4 reviews the challenge brought by Schmitt.
第四章节综述施米特带来的挑战。
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