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I'm not guaranteeing the source, but in answer to your questions: http://www.odan.org/corporal_mortification.htm

Quote:

Corporal mortification is regularly practiced in Opus Dei. It is perhaps one of the most startling aspects of Opus Dei life for people outside the group. Many of the practices of corporal mortification were at one time more regularly practiced within the Church; however, due to modern psychology and thinking, the practices which inflict pain are sometimes considered to be counterproductive to one's spiritual development, as they can easily lead to pride and an unhealthy attitude toward one's body.
Some acts of corporal mortification may be helpful in checking the desires of the flesh, such as fasting. However, in Opus Dei, especially for the numerary (celibate) members, all of the practices mentioned below are mandatory if one wishes to live the "Spirit of Opus Dei" fully. The "Spirit of Opus Dei" is the standard of living, as outlined by the Opus Dei directors, for which all truly dedicated Opus Dei members strive. Under the umbrella of the "Spirit of Opus Dei" hide many of the abuses in Opus Dei. The subtle control to conform to the norm is typical in groups which practice mind control; members are "guilted" into conforming, feeling that they must in order to follow "God's will" as it is outlined by the controlling group.
Listed below are the ways Opus Dei numeraries practice corporal mortification:

Cilice: [Photo of cilice] a spiked chain worn around the upper thigh for two hours each day, except for Church feast days, Sundays, and certain times of the year. This is perhaps the most shocking of the corporal mortifications, and generally Opus Dei members are extremely hesitant to admit that they use them. It is a painful mortification which leaves small prick holes in the flesh, and makes the Opus Dei members tentative about wearing swim suits wherever non-Opus Dei members may be.
Discipline : [Photo of discipline] a cord-like whip which resembles macrame, used on the buttocks or back once a week. Opus Dei members must ask permission to use it more often, which many do. The story is often told in Opus Dei that the Founder was so zealous in using the discipline, he splattered the bathroom walls with streaks of blood.
Cold Showers : Most numeraries take cold showers every day and offer it up for the intentions of the current Prelate.
Meals : Numeraries generally practice one small corporal mortification at every meal, such as drinking coffee without milk or sugar, not buttering one's toast, skipping dessert, not taking seconds, etc. For the most part, eating between meals is not practiced. Opus Dei members fast on the Church's prescribed days for fasting, but otherwise must ask for permission to fast on their own.
The Heroic Minute : Numeraries are encouraged to jump out of bed and kiss the floor as soon as the door is knocked in the morning. As they kiss, they say "Serviam," Latin for "I will serve."
Silences : Each night after making an examination of conscience, numeraries do not speak to one another until after Holy Mass the following morning. (They do not say "Good morning" to anyone as they are getting ready.) In the afternoons, they try to avoid speaking until dinnertime. On Sundays, numeraries generally do not listen to music, especially in the afternoons.