BORN TO RUN…SLOW

Pining for a PB? You’re up against evolution itself. Humans have evolved to run at speeds that require the least energy expenditure, according to new research. After analyzing data from more than 37,000 daily runs via wearable trackers, researchers found whether runners were heading out for 2, 4 or 6+ miles, they ran at virtually the same pace to allow for max calorie preservation. To avoid falling into the slow-asyou-go model, try these tips for building fast-twitch fibers: Go hard uphill and easy downhill, find a faster running buddy and listen to music with 165 to 185 bpm.