In the study, half of the 32 participants took a daily fish oil supplement (400 mg) for 26 days; the other half took a placebo. They were then put through a 20-minute downhill running workout on the treadmill, which has been shown to cause muscle damage (as anyone who’s tried downhill running can tell you). Over the next 4 days, the participants kept taking the supplement (or the placebo) and were asked to rate muscle soreness in their legs on a scale from 0 to 10, or “no soreness” to “unbearably painful.” They also had their blood tested for markers of inflammation. Compared to the placebo group, the fish oil group reported significantly less soreness in their legs and had lower levels of inflammation in their blood. “The omega-3 fatty acids in fish oil have anti-inflammatory properties,” says sports doctor Jordan Metzl, who was not involved in the study. “Just as those properties keep your heart healthy, they can keep your muscles in good shape, too.” If you’d rather not take a fish oil supplement, you can always add more fish to your diet, says Metzl. Or try one of these other science-backed solutions for muscle soreness: Foam Rolling This DIY massage technique is getting a lot of buzz lately, and for good reason: Foam rolling after a workout has been found to ease muscle soreness by releasing the tiny knots that build up in overworked muscles and improving circulation, according to research published in Medicine & Science in Sports & Exercise. Here’s how to get started with foam rolling. Tart Cherry JuiceJournal of the International Society of Sports Nutritiontart cherry juice Cherries are filled with anthocyanins, powerful antioxidants that block inflammation and suppress pain enzymes. A study published in the found that runners who drank 2 glasses of for a week had less muscle pain after a distance run. Plus, the same drink’s also been shown to help you get more sleep. Talk about a win-win. Caffeine Loading up on caffeine before a workout isn’t everyone’s cup of tea (or coffee), but research at the University of Georgia found that it can reduce muscle soreness by up to 48%. It works by blocking adenosine, a pain-stimulating chemical that’s in your muscles. MORE: This Is Your Body On Coffee