The hottest fitness trends for 2015 are body weight training and high intensity interval training, according to the ninth annual survey of 3,400 health and fitness professionals worldwide by the American College of Sports Medicine.
Yoga is the most popular specialty class, with Bikram yoga (26 postures performed over 90 minutes in a hot room) especially in vogue. Zumba, once the most popular fitness class, is passe. No. 9 in ACSM’s survey in 2012, Zumba fell to 34 this year.
Body weight training is resistance training in which you use your own weight, rather than barbells, dumbbells, kettlebells or exercise machines, to build muscle and strength. The most familiar examples are pushups, pullups and burpees (squat thrusts to Army and Marine veterans).
High intensity interval training, also known as HIIT, involves short bursts of intense activity, followed by brief periods of rest. You can burn more fat and build more muscle in the half hour or less it takes to perform a typical HIIT routine than you can in an hour or more of conventional aerobic or resistance training, multiple studies have shown.