When should you not do yoga inversions?

Related questions

1. Who introduced yoga first time?
2. Is yoga a Hindu or Buddhist?
3. How often is Yoga Journal published?
4. What is said at the end of a yoga session?
5. Which is better yoga or pilates?
6. How many poses are there in yoga?
7. Is yoga a religion or a philosophy?
8. Which is better exercise or yoga?
9. Is Downward Dog an inversion?
10. Is yoga enough to stay fit?

Tags

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2. #heart
3. #shock
4. #lungs
5. #enormous
6. #tools
7. #powerful
8. #bring
9. #benefit
10. #person
11. #blood
12. #circulation
13. #inversions
14. #elevating
15. #asanas
16. #system
17. #these
18. #extremities