People set all kinds of goals when they work out. Feeling better. Losing a few pounds. Becoming a bit healthier.

Consumers in sporting goods stores today are faced with seemingly countless choices of footwear. But are any of those innovations really helping you run longer or jump higher? And are those expensive sneakers any better?

'Maximalist' trainers don't transform performance, suggests a new study—but that hasn't stopped top athletes from wearing them.