If you’re looking for a way to amp up your fitness routine, vitamin D may be your new best friend. According to a recent study, vitamin D not only reduces cortisol levels (the “stress hormone”), but it may also improve exercise performance and lower the risk of heart disease. Over the course of two weeks, researchers had 13 healthy adults take either vitamin D or a placebo before working out. They discovered lower blood pressure levels in the individuals who took the vitamin D than the individuals who took the placebo. They also found that the group who took the vitamin D outperformed the placebo group by 30% in the fitness test. So, next time you’re struggling to reach that extra mile, try popping a vitamin D pill!