5-     To cover one's unlawful nakedness. For the man this is from his belly button to his knees. The woman has to cover her entire body except for her face and hands.

6-     To be certain that the prayer time has set in.

7-     Not to deem any of its integrals recommended.

8-     To direct one's chest toward the Qiblah, which is in Makkah.

If one leaves out any one of these conditions, one’s prayer is invalid.