This might be a surprise to many people, but running targets the core muscles. Have you ever seen an avid runner without a six-pack abs? Well, the answer is no. Also any sport that includes lots of running (like football a.k.a., soccer) will qualify. For those who cannot run because of joint problems, the alternative is swimming. In fact, swimming is as effective as running, especially when one advances in age. We recommend running at least 22 minutes. Besides the desired six-pack abs, running helps the strongest pump ever, the human heart. Many believe that running is a complete set and qualify as a rigorous exercise regimen. We are confident that once you see the results, you will never want to go back to your pre-six-pack abs days.