Learn Turkish: Düzenli egzersiz yapmak lazım. - It is necessary to do regular exercise.

When you use lazım (necessary) right after a plain infinitive verb like yapmak (to do), it creates a general statement about what is necessary. Because we didn't add any personal suffixes to the verb, it applies to everyone in general, rather than a specific person.

Could we use gerek instead of lazım in this sentence?

Yes! You can say Düzenli egzersiz yapmak gerek and it means exactly the same thing. Both lazım and gerek are used after -mak or -mek verbs to express a general need or requirement.

Why do we need the verb yapmak here?

In Turkish, egzersiz is just a noun meaning "exercise". There isn't a single, standalone verb for "to exercise", so you have to pair the noun with the helper verb yapmak (to do or make).

How does the suffix -li work in the word düzenli?

The word düzenli (regular) is made from the noun düzen (order or arrangement) and the suffix -li (with or having). Literally, it means "having order", which translates perfectly to "regular".