Modes are varying arm and shoulder speeds that are suitable for various different sequences.
SPLIT-TIME ARMS (CRAWL-MODE)
In the crawl mode, the arms move in split-time, just like when swimming the crawl. This balanced rhythm makes the crawl mode pleasant to do and is ideal for entering and leaving positions as well as combined steps and turns.
SAME-TIME ARMS (BRACE-MODE)
The brace mode is a bit like breaststroke and is more static than the crawl mode. However, it is perfect for visual moves like pirouettes and flowers.