Please expand your answer to include women as well.
There are a number of Ahaadith which mention one form of standing or another
as Nabi (Sallallaahu Alayhi Wasallam) stated, ‘Straighten your rows, or else
Allah will cause friction between your hearts.’ (Ma’arifus Sunan).
There is no fixed or stipulated space which has to be left between the feet.
That which is comfortable and convenient will be regarded as Sunnah.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai
FATWA DEPT.