RX5 sets: 500m fast run, 200m recovery jog, 100m sprintNo rest between interval3 min rest between sets200M is important !!! It must be slow/easy enough so you are recovered for the sprint.Performance4 sets: 400m fast run, 200m recovery jog, 100m sprintNo rest between interval3 min rest between sets200M is important !!! It must be slow/easy enough so you are recovered for the sprint.Fitness4 sets: 300m fast run, 200m recovery jog, 100m sprintNo rest between interval3 min rest between sets200M is important !!! It must be slow/easy enough so you are recovered for the sprint.