It is good to always put forth your best effort
Andrew is starting a workout routine and has a hard time lifting even light weights.
Andrew wants to finish his workout routine.
Andrew pushes himself hard and just barely finishes the routine before collapsing.
Andrew lowers the weights a bit, so he can finish his routine easily and with energy to spare.
Andrew's muscles grow and the weights become easier to handle, eventually accomplishing his goals.
Andrew never gets stronger because the weights are too light and don't push his body to its limits.