Assuming you have a reasonable distance to stop at the end of the track. Our track had 30m to stop after the 60m before to were at the wall. You could run the 60 and decelerate to the wall, then immediately turn around and run from the wall to a mark or cone set 30m up from the 60m start, slow to the start line, turn around and repeat for the number of reps you have planned. Breaks were complete between set- often 20min.