Goudy is right. 5x5, 6x6, 10x10, whatever you're using, the loads you use should be submaximal. The fewer reps and sets you use, the higher percentage 1RM you can use - if you're doing 10x10, you might use 40%, 5x5 maybe 65-75%. You don't need to take it to failure, but by the end of the last set it should start to get a little difficult.