PUSHING BEYOND FAILURE
If you do 10, 20 or 50 reps but you stop the exercise the moment it starts hurting than you can easily say that you did 0 reps.
It's not how many reps you've done comfortably that counts but it's how many reps you've done under maximum muscular tension and near failure. In this case the more appropriate way to count the reps would be 1,2,3 or possibly 4 reps.
