"The See-Saw Principle"

Definition

The See-Saw Principle is the balance between two extremes: over-competence (being so good at something you're bored and on autopilot) and over-challenge (being so overwhelmed you can't think, create, or respond). Emotional agility requires finding the sweet spot in between — what David calls "the zone of optimal development" — where you're living at the edge of your ability, not over-competent and complacent, but also not in so far over your head that you're paralyzed. You get there by incrementally advancing yourself through small tweaks, expanding both your breadth (what you do) and your depth (how well you do it).

In the Book

David opens with a funny, messy story: her friend George's four-year-old son George Jr. tried to shave with his dad's safety razor and gave himself a bloody cut on the chin. The lesson is human, not tragic — children are innately curious and want to be competent. They increase competence by trying new things. The challenge is finding the equilibrium.

David contrasts two unhealthy states:

Over-competence happens when you know a skill so well that you can do it with your eyes closed. You already know what the day will bring. You're not expanding your skills or sense of possibility. In a marriage, you know exactly what your spouse will order. In a job, you're on autopilot. In family dynamics, you can predict Christmas dinner word for word. There's no challenge or joy or discovery. You're lulled back into complacency and disengagement. You fail to thrive.

Over-challenge is the opposite: you're juggling so many complexities that even Superman couldn't manage it. You're walking on eggshells in an unpredictable relationship. You're so stressed that you can't be creative, responsive, or adaptive. You become frozen rather than agile.

The See-Saw Principle says find the give-and-take, the creative tension between competence and challenge. In a playground see-saw, you need resistance on the other end so you don't crash, but not so much weight that you're left hanging high and dry. Similarly, in life and work and relationships, you want to live at the edge of your ability — challenged but not overwhelmed.

David addresses why people often get stuck on one side: fear. Our brains confuse safety with comfort, and comfort is what feels familiar and accessible. When something feels new or difficult, fear kicks in and says "no" — disguised as procrastination, perfectionism, shutting down, or excuses. This is evolutionary: under stress, we retreat to what's familiar. But that retreat keeps us from growing.

She also explores "the coherence of bad decisions" — our tendency to prefer information that fits our existing self-image, even when it's self-limiting. People with low self-esteem prefer feedback that confirms they're not good enough; people who think poorly of themselves avoid people who view them positively (it doesn't feel coherent). We'll self-sabotage to maintain coherence with an old story about ourselves.

David's solution is incremental advancement: small tweaks that move you toward the edge of your ability. In relationships, creative lives, personal development, and work, you promote advancement by expanding your breadth (skills you acquire, topics you explore) and your depth (quality of listening, level of engagement). A tennis player gets better playing someone just a little better than they are, not a world champion.

But she warns against arbitrary expansion. Don't add to your plate simply because you can or because you feel pressure to be the best or most fabulous. This isn't about being busy for busy's sake. It's about building the life you want, with choices aligned with your values.

Why It Matters

This concept explains why complacency and overwhelm are both forms of rigidity — they're both departures from emotional agility. It also clarifies the relationship between the Tiny Tweaks Principle (small incremental behavior changes) and growth: tweaks move you along the see-saw, incrementally expanding your zone of optimal development. The principle applies across domains: work, parenting, learning, relationships. It answers the question "How do I know if I'm growing?" — you should feel challenged but not panicked, engaged but not bored.