How quickly can they close the track? Do they kick you out less than 20min after your 55m race? That’s all you need to get another four 55m sprints under your belt (one every 5min). BTW: Running a 300m after your 55m race is very different to running another four or five 50 or 60m sprints: 1 submaximal acceleration vs. 4-5 maximal accelerations; never reaching top speed vs. reaching top speed 4-5 times; high lactate levels vs. low lactate levels…