Starting with 2 to 2 1/2min between reps and 5 min between sets at a pace that could be completed without a drop-off (as much as 8 tenths off pb time at first) The sets started with reps of 6, then moved to reps of 4 with same recoveries, then to sets of 4 x (4 x 60) spreading out the recoveries. Not unlike the workouts Mennea did.