The phrase "the king of all exercises" is a colloquial expression used to describe an exercise that is considered to be the most effective or beneficial among various options. It implies that this particular exercise offers more benefits than any other, and therefore it should be given priority when designing a workout routine. However, there isn't one specific exercise that can be referred to as "the king of all exercises," as different people may have varying opinions on what constitutes the most effective or beneficial exercise. Ultimately, the best exercise for an individual depends on their goals and physical abilities.