Will "let's do an exercise" also work or is this something of a compound verb in practice, where it always refers to exerciseS?
that's also fine
what are the suffixes for let's ?? mobile version isn't really informative to new lessons
-alım or -elim, depending on vowel harmony :-)
In translation 'let's excercise' is okay, but i think 'do' is required when yapar is used, at least where duo is concerned