Rugby apparatus, comprising: a rugby head guard arranged to receive a user's head, the rugby head guard having a hole positioned at a rear side of the rugby head guard, wherein the hole extends through an entire thickness of the rugby head guard; a pocket receivable into the hole formed in the rugby head guard; and, an impact detection arrangement (80, 800) receivable into the pocket to couple the impact detection arrangement (80, 800) to the rugby head guard, the impact detection arrangement (80, 800) comprising: a sensor (84, 824) configured to detect an indication of an acceleration change experienced by the user's head when the rugby head guard is being worn; a visual indicator (94, 822) configured to provide a visual indication when the detected acceleration change exceeds a threshold; and, a housing (100, 802) arranged to house the sensor (84, 824) and the visual indicator, wherein the pocket is formed from a material having a lower stiffness than the housing (100, 802) of the impact detection arrangement (80, 800), wherein the pocket includes a protective surrounding portion defining an aperture sized to receive and secure the impact detection arrangement (80, 800) therein, wherein the pocket includes a flange portion extending from the protective surrounding portion, and wherein the flange portion is attached to the rugby head guard, and wherein the pocket is received into the hole of the rugby head guard such that the flange portion is at an inner side of the rugby head guard and the surrounding portion extends through the hole. a rugby head guard arranged to receive a user's head, the rugby head guard having a hole positioned at a rear side of the rugby head guard, wherein the hole extends through an entire thickness of the rugby head guard; a pocket receivable into the hole formed in the rugby head guard; and, an impact detection arrangement (80, 800) receivable into the pocket to couple the impact detection arrangement (80, 800) to the rugby head guard, the impact detection arrangement (80, 800) comprising: a sensor (84, 824) configured to detect an indication of an acceleration change experienced by the user's head when the rugby head guard is being worn; a visual indicator (94, 822) configured to provide a visual indication when the detected acceleration change exceeds a threshold; and, a housing (100, 802) arranged to house the sensor (84, 824) and the visual indicator, a sensor (84, 824) configured to detect an indication of an acceleration change experienced by the user's head when the rugby head guard is being worn; a visual indicator (94, 822) configured to provide a visual indication when the detected acceleration change exceeds a threshold; and, a housing (100, 802) arranged to house the sensor (84, 824) and the visual indicator, wherein the pocket is formed from a material having a lower stiffness than the housing (100, 802) of the impact detection arrangement (80, 800), wherein the pocket includes a protective surrounding portion defining an aperture sized to receive and secure the impact detection arrangement (80, 800) therein, wherein the pocket includes a flange portion extending from the protective surrounding portion, and wherein the flange portion is attached to the rugby head guard, and wherein the pocket is received into the hole of the rugby head guard such that the flange portion is at an inner side of the rugby head guard and the surrounding portion extends through the hole.