Muslims do their normal duties and committments during fasting as in normal non fasting days. However, they get the capacity and efficiency to do it because of their strong faith in Allah (God in English and same God worshiped by Jews and Christians).
Fasting per Islam rules means that for the Muslim adult, sane, healthy he/she is required to fast from dawn (first light) to sunset every day in the month of Ramadan (or voluntarly on other days of the year). Muslim fasting involves refraining from eating, drinking, smoking, and marital intercourse during the daylight hours.
There are numerous health as well as spiritual benefits to Islamic fasting. Refer to link below.
when do Muslims know when to start and stop fasting
Christians do not have a fasting month, only Muslims do.
shadan
Ramadhan
The holy month of Fasting on the Islamic calender is called "Ramadan"
Ramadan. The five pillars (for Sunni Muslims) include fasting, and Ramadan is the time of fasting. Shia Muslims have fasting as one of their practices rather than a pillar of faith.
from the age of puberty.
doing fasting
Muslims stop fasting when they can see the new moon that is the first day of next Islamic calendar month.
During the month of Ramadan fasting is compulsary for every adult muslim.
Yes Muslims can spit when fasting! I have!
Muslims typically begin fasting during Ramadan at the age of puberty, which is usually around the age of 12 or 13.