Bikram yoga involves 26 poses sitting in a room heated to 40 ° C ( 105 ° F ) Typical sessions lasting 90 minutes and doctors say it improves mindfulness , flexibility , strength , muscle strength and general fitness . 20 volunteers take part in a new study to monitor body temperature . doctors warn one man 's temperature reached 40 ° C/105 ° F putting him at risk of heat exhaustion and heat stroke .
Bikram yoga involves 26 poses performed in a room heated to 40°C ( 105°F ) Typical sessions last 90 minutes and advocates say it improves mindfulness , flexibility , strength , muscle tone and general fitness . 20 volunteers took part in a new study to monitor body temperatures . Experts warn one man 's temperature reached 40°C/105°F putting him at risk of heat exhaustion and heat stroke .