People often comment on the fact that the sport of swimming has had a relatively high number of new world records set over the past few decades. Many other developments have occurred in the sport during that time, including the manufacture of swimsuits that create less resistance as swimmers move through the water, and improvements in the design of the starting blocks used in races. Even the engineering of swimming pools has evolved. Engineering advancements make it easier to maintain an optimal water temperature and other conditions in the pools where top competitions are held and the time records set. Most recently, computer software was developed that allows elite swimmers to analyse the tiniest part of their movement in the water in order to keep adjusting their swimming strokes.