Eazy Tip
 

Pick the weight you'd normally use for a given set, go to failure, rest 15 seconds, then pick the weight back up and rep out again. Repeat one or two more times. The number of reps you'll be able to perform will decrease significantly with rest-pause so don't expect to fail at 10 reps, rest 15 seconds, then get another 10. Chances are, you'll only be able to get three to five more reps tops. One way to avoid a big drop-off is to stop a couple reps short of failure on the initial set, which will allow you to get more reps after resting.