HIIT BECAME HUGE
Like LOL and WTF, HIIT doesn’t need spelling out. Named the number one worldwide fitness trend in 2014 by the American College of Sports Medicine, high- intensity interval training ( in case you missed it) is still the go- to way to torch max kJs in minimum time. More incentive? Mayo Clinic researchers found that three weekly sessions on stationary bikes for 12 weeks can boost cells’ ability to produce energy by up to 69 percent – and reverse age- related decline of genes, such as those related to muscle growth. Boom.