1. 准备活动;热身活动
    A warm-up is something that prepares you for an activity or event, usually because it is a short practice or example of what the activity or event will involve.

warm-up

    e.g. The exercises can be fun and a good warm-up for the latter part of the programme...
           这些练习很有趣，而且为该课程后面的部分做了很好的铺垫。
    e.g. The criticism was merely a warm-up for what is being prepared for the finance minister...
           对于财政部长即将面临的困境而言，这些批评只是个小小的开始。

1. exercising in preparation for strenuous activity

    Synonym: tune-upprolusion