Then the two groups switched diets for another 14 days.

然后，两组人员又交换了另外14天的饮食。

I tried to move to, like, an altitude training group, switched coaches.

我试着转到，比如，一个高原训练组，换了教练。

After two weeks, the groups switched meal plans, so that the big dinner folks became the big breakfast folks and vice versa.

原来“早多吃” 那一组改为“晚多吃”组，反之亦然。