5 laps (slow jog/warmup) > 1 lap (sprint) + 1 lap (slow jog) x 5 rounds > 5 laps (recovery run) It's been a year since last interval session and it must sustain.
26029.9 km | 
4177.1 km
8.9 km | 00:49:31 | 05:33/km
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