Sabrena Jo, Ph.D., senior director of science and research at the American Council on Exercise, has decades of experience helping people find ways to become physically active. From working one-on-one ...

Whether you just signed up for your first 5K or your first marathon, one of the most important steps in prepping for race day is finding a training plan that works for you. Both beginners and ...

Runners of all types rely on run/walk intervals both to train and race. These intervals can help increase speed and mileage for faster overall race times. However, there is a sticking point! This ...

Training plans mean different things to different people. Perhaps you’re a seasoned interval trainer, or maybe you’ve never tried one before. Regardless, a good training plan is something we can all ...

Beth Skwarecki is Lifehacker’s Senior Health Editor and has been writing about health, fitness, and science here since 2015. Beth was the recipient of the 2017 Carnegie Science Award in science ...