I used to get the flu once a year, or at least one cold with the change of the seasons. Otherwise, I was very healthy. That was my story for about 30 years. I biked, ran, Nordic skied, and did yoga in between. Then I started a serious yoga practice, developed a sadhana, began aligning my practice with my dosha, and built a home studio. My asana and meditation practice usually lasts 90 minutes a day.