Want to train your core in just five minutes? Here’s a simple routine you can do anywhere: • In and outs – 60 seconds to target your entire trunk • Leg lifts – 60 seconds for lower ab strength • Russian twists – 60 seconds to build rotational control (add weight when it gets easy) • Bear hold – 60 seconds for anti-extension and anti-rotation strength (lift a hand or foot for a challenge) • Posterior plank – 60 seconds to train your glutes, spine, and posterior chain No fluff. Just five minutes o