happy medium

the/a happy medium (a state or way of acting / thinking or doing sth which avoids being extreme, often combining the best of two opposite states or ways of doing sth) — золотая середина, золотое сечение

to strike/achieve/find a/the happy medium (between sth and sth) — найти золотую середину/золотое сечение (между)

Example 1: I'm either exercising all the time or I'm doing nothing but I can't seem to find a happy medium.
Example 2: It's a case of finding the happy medium between firmness and compassion.

[happy mean]