From barre class to boot camp, planks are everywhere – and that’s because nothing beats them for strengthening your core, says US trainer Kira Stokes, creator of the Stoked Method, a high-intensity training system. “The core muscles [including abs, back, and glutes] power all of your body’s movements,” Kira says. “Firming them up will improve your performance, prevent injury, and make daily activity feel easier.” Plus, cinch your waist.
But a static plank doesn’t rank high on the calorie-burning scale, so for this HIIT quickie, Kira cooked up moving versions that let you burn while you firm, and added plyometric bursts to fire things up even more. Your mission through each of the three mini circuits: “Keep moving so your heart rate stays up and you boost your metabolism,” she…