50-40-30-20-10

50-40-30-20-10 is five reps rounds, where the first round contains 50 reps, the 2nd round contains 40, and so on dropping down to the last round containing 10 reps.  If there are multiple exercises you should complete each of the exercises per the reps in that round, before dropping down to the next next rep round and repeating each of the exercises per the reps in that next round, and so on.