It may sound counterintuitive, but the more intensely you exercise the more damaging free radicals your body produces. Enter almonds. They’re a top source of antioxidants like flavonoids, phenolic acids, and vitamin E—all of which protect against harmful free radicals. In fact, cyclists who ate 60 almonds a day before meals for four weeks boosted their antioxidant capacity by 43 percent according to a study presented at the 2009 annual meeting of the American College of Sports Medicine. They also increased their trial time distance by 5 percent too.