1 / 3   Boston firefighter recruited Jonathan Hsu who is a yoga coach to take part in a Vinyasa Flow yoga class during training at the Boston Fire Academy on Moon Island in Boston Harbor on Wednesday. /VCG Photo

2 / 3   The yoga curriculum now is part of the 21-week fire academy and has been credited with helping reduce the rate of firefighters’ injuries. /VCG Photo 

3 / 3   The Wednesday yoga session was part of a five-day course led by O2X Human Performance, a Quincy-based company that teaches physical fitness, nutrition and wellness to first responders. /VCG Photo