 In terms of competition rules and physical demands , long distance track races have much in common with middle @-@ distance races , except that pacing , <unk> , and race tactics become much greater factors in performances . However , a number of athletes have achieved success in both <unk> and long @-@ distance events , including <unk> <unk> who set world records from 1500 m to 5000 m . The use of pace @-@ <unk> in long distance events is very common at the elite level , although they are not present at championship level competitions as all qualified competitors want to win . 
