Nafl may be performed seated even by someone who can stand; fard requires standing when able.
Outside the town, voluntary prayer on a moving mount may use gestures and follow its direction.
Witr has a distinct legal status and requires recitation in each rakah, so not every nafl concession automatically transfers to it.
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Voluntary Prayers: Regular Sunnahs, Nawafil and Juristic Differences
Nafl may be performed seated even by someone who can stand; fard requires standing when able.
Outside the town, voluntary prayer on a moving mount may use gestures and follow its direction.
Witr has a distinct legal status and requires recitation in each rakah, so not every nafl concession automatically transfers to it.