Ever hear of HMB? Also known as beta-hydroxy-beta-methylbutyrate, this amino-acid supplement can potentially boost your aerobic performance.

In a Canadian study, exercise newbies who took 3 grams of HMB daily while undergoing 5 weeks of interval training experienced double the cardiovascular gains of a placebo group. Further testing is under way.

In other news, staying distracted while running helps you exercise for 20 percent longer, according to Belgian researchers. That’s why Life Fitness is now manufacturing a treadmill that syncs with your iPod’s music and video libraries.

An LCD screen on its console allows for watching your latest downloads. The machine should be available by now. [source: Men’s Health]