Some exercises (Turkish getup) are complex and require coordination. Others (sprinting uphill) can inspire results, and while simple, are far from easy.
We tend to overlook habits and practices that can bring us disproportionate value, because they seem too “simple” to be valuable. Deliberately creating a mindfulness, anger management or compassion practice requires very little time and nothing complicated. Simple, but not easy.
Don’t underestimate the significance of simple tools and habits, used consciously, properly, and with intent.