As we most endurance athletes begin now to become "serious" about their training, one of the questions also asked and always debated is "Should I be lifting weights?
Generally considered a "correct" thing to do, there are also negative attributes that can be attributed to lifting weights as well. One of the biggest is time. If an athlete only has time to do either a 45 minute bike or a 45 minute strength session focusing on the legs, usually it is better to go ahead and do the sport specific workout - the bike.
However, there are many positives associated with strength training such as stronger muscles and the ability to withstand injury. For more information on strength training for the endurance athlete, check out this article.