(1) Saumul-Wisal is Makrooh. Saumul Wisal is to fast the whole year including the forbidden days.
Saumul Wisal according to another authoritative version also means fasting continuously – day after day – throughout the year excepting the forbidden days.
(2) The best method of Nafl fasting is to fast every alternate day. However, due to the physical weakness of most people in this age, Auliya advise abstention from abundance of Nafl Saum.
(3) When fasting on the Day of Ashora (10th Muharram), it is Sunnat to add another day. Therefore, one should fast on either the 9th and 10th or the 10th and 11th Muharram.
Read more... (272 words, estimated 1:05 mins reading time)