while they recover from concussion. olympic gold medallist shona mccallin is among them after taking a shoulder to her head during a match in february and has described her injury as "overwhelming" and "relentless". katie shanaghan has been to meet her. harder. faster. stronger. a sport —— as sport develops, concussion is becoming one of its biggest challenges. for me it is a personal issue too. i grew up playing hockey for england before a blow to the head made me decide to leave the sport and i have not played since. as london prepares to host the women's world cup, the sport i love is the latest to be thrown into the concussion sports light —— spotlight. great britain have won the olympic gold medal! history makers in 2016 but for two of great britain's 0lympic makers in 2016 but for two of great britain's olympic gold medallists, there will be no home world cup. shona mccallin was concussed in a