Training to failure is a popular training technique. How effective is the method?

Research by Kraemer et al. (2005) compared a group of men who trained to failure (RF) with a group of men who did not train to failure (NRF). Both groups trained for 11 weeks followed by a five week peak strength programme. The results showed that the RF group improved mainly in local muscular endurance, while the NRF group increased lower limb strength.

Therefore training to failure most likely will improve local muscular endurance but not likely maximum strength/power, where a traditional strength programme of sets and repetitions will do the job.