Rukoo and sajdah for a person performing salaah on a chair
Q: Due to being unwell, a person performs Salaah sitting on a chair:
1. In such a case, how does he perform the ruku and sajda? Does he lower only his head OR his entire upper body?
2. For the sajdah, does he have to extend his hands further than his knees, creating a "place of sajdah"?