Tea, the way
Yoga, the union
Mind, the nutrients
Essence of being
The essence of yoga is to achieve a union. The union of body and mind. It has three aspects: flexibility, balance/ alignment, and strength.
Yoga is to challenge yourself. It's not like martial arts where there's always a sense of fighting with external enemies. Yoga is a battle, too. But here the sole enemy is yourself. Whether you can do a headstand or frint split have nothing to do with overcoming others, but to overcome yourself, your own body and mind.