This is Yuji Beleza, and he calls himself a wannabe polyglot, aka a language enthusiast, someone who speaks and understands multiple languages fluently.
Frederique describes being a polyglot as a brain workout. This means it is exercise for your brain that can make it stronger. Now, Hannah, I don't know about you.
Find effective methods which you can use systematically over the period of some time in a way which you enjoy, and this is how polyglots learn languages within months, not years.
However, some linguists argue that viral videos showing polyglots switching between languages often rely on memorised phrases rather than proving genuine conversational ability.
Lydia Machova, a Slovakian polyglot and language mentor, is currently fluent in seven foreign languages and says she likes to learn a new language every two years!