Very effective. I practiced yoga for a year when I was 7 years old, and now I'm almost 30 years old. My body flexibility and coordination are still first-class. My figure is praised by everyone. I can also put my feet on my head and walk with my hands. I never get sick.
If it doesn't work, practice difficult yoga. After a long time, you will find that your body really becomes strong and healthy!
Beginners practice directly, just have confidence, don't care about the difficulty!