fad. It has been used by athletes such as A. J. Soares and Olympic swimmer Michael Phelps as well as other celebrity endorsers and is getting to become "common practice" among athletes from different sports, including American football, association football (soccer), long distance running, rugby, tennis, volleyball, and other sports. There was a report that sports equipment manufacturers are considering different designs for ice baths. In the summer of 2014, as a fundraising method, the nonprofit ALS Association, which raises money for research and public awareness of amyotrophic lateral sclerosis or ALS, also known as Lou Gehrig's disease, began the Ice Bucket Challenge which involved donors filming themselves and challenging other donors to participate and then being doused with a bucket of ice cold water; as a fundraising effort, it raised $16 million over a 22-day period. There are indications that ice baths may be gaining popularity with groups outside sports, such as dance. The Pittsburgh Post-Gazette reported that some Radio City Rockettes, a precision dance company performing in New York City, use ice baths after a long day of performing as a way to "unwind" and cope with "aches and pains." One report suggested that entertainer Madonna used ice baths after her performances. And there are indications that use of ice baths is spreading to amateur sports, such as high school football. Explorer and athlete Fiann Paul is known for using ice baths as part of his training routine. Ice baths are a part of a broader phenomenon known as cryotherapy—the Greek word cryo (κρυο) means cold—which describes a variety of treatments when cold temperatures are used therapeutically. Cryotherapy includes procedures where a person is placed in a room with "cold, dry air at temperatures as low as −135 °C" for short periods of time, and which has been used in hospitals in Poland as well as a center in London to treat not only muscular ailments, but psychological problems such as depression. Basketball player Manny Harris reportedly used a Cryon-X machine featuring extreme low temperatures around minus 166 degrees Fahrenheit, but used it with wet socks resulting in a serious freezer burn. Occasionally ice baths have been an ill-advised treatment of fever in young children, but that doctors were counseled not to use this technique because of the risk of hypothermia. Ice baths have been suggested as a way to prevent muscle soreness after shoveling snow. In addition,