Ramadan
Not everyone has to fast in Ramadan.  Children do not have to fast.  They should start when they reach the age of puberty, so long as they are healthy.  People who are travelling long distances do not have to fast. Pregnant women do not have to if they think it might harm their unborn baby.  Sometimes sportsmen do not observe the fast, although there are disagreements about this.  For example, the Olympic Games in 2012 fell in the middle of the holy month.  This made it very difficult for the sportsmen who could not eat or drink during daytime.