主要原因之一是人们想挑战自己。

One of the main reasons is that people want to challenge themselves.

她挑战自己连续做十个俯卧撑。

She challenged herself to do ten pushup in a row.

我买了一个新的拼图来挑战自己。

I bought a new jigsaw to challenge myself.

她挑战自己一次做50个俯卧撑。

She challenged herself to do 50 push-ups in one go.

如果你不挑战自己，你的技能会停滞。

If you don't challenge yourself, your skills will stagnate.

她决定通过学习一门新语言来挑战自己。

She decided to challenge herself by learning a new language.

他挑战自己不停地做100个仰卧起坐。

He challenged himself to do 100 crunches without stopping.

她喜欢每个周末用一颗硬糖来挑战自己。

She loves to challenge herself with a jawbreaker every weekend.

她挑战自己在一分钟内完成50个波比跳。

She challenged herself to complete 50 burpee in one minute.

她故意地选择了更困难的道路来挑战自己。

She knowingly chose the more difficult path to challenge herself.