Always reserve a piece of myself for myself. In asanas and relationships, don't go all the way. Hold back a bit. I did 5 hours of yoga, worked hard, really stretched, participated fully, and i feel good and ready for tomorrow. In the past i would wear myself out with my interests and pursuits. I used to grind myself to the bone and give everything to a project. It eclipsed my health and relationships. I always felt some overwhelming need to be successful at something, to prove myself. I've replaced that with a 70% rule.