SCUBA : Self-Contained Underwater Breathing Apparatus.
I´m treading water : I´m not making any progress.
I´m out of my depth : It´s too hard.
Let´s test the waters : Let´s experiment.
Learn how to use some common English idioms and expressions in everyday life. In this intermediate English lesson you will see two people a a gym talking about their fitness routines and some unusual sports. They use some common expressions during their conversation.