every now and then i get really bad back pains in my lower back, i think it might because i sleep differnt sometimes or somthing but basicly if i lean over my coxik or however you spell it (the bone at the bas of my spine) really reallly hurts. im 18 male and physically fit i run and go to the gym alot but when my back hurts i cant really do anything. please i need to help as im going skiing tomorrow 
p.s iv tried sleeping on differnt beds thanks guys xx
p.s iv tried sleeping on differnt beds
thanks guys xx