While some claim that hot yoga has positive health benefits, others are more skeptical about its safety. Bikram yoga involves completing a series of poses in a room heated 104 to 105 degrees Fahrenheit. Through a study on the physical effects of hot yoga by a team at Colorado State University, increases in strength, muscle control, and balance were observed in the participants. As the humidity rises and the heart pumps harder, minerals like potassium and sodium are released. However, there is only a slight drop in body weight. While the participants felt that they were working hard, the actual change in weight was minimal. Heart rate and core temperature climbed significantly, but the metabolic rate was only equal to that of a person speed-walking.