One such inspirational volunteer is Corina Walker, aged 71, who leads weekly Tai Chi Qigong sessions for older people in Cardiff.
Un o’r gwirfoddolwr ysbrydoledig hyn yw Corina Walker, 71 oed, sy'n arwain sesiynau Tai Chi Qigong wythnosol i bobl hŷn yng Nghaerdydd.