The ‘15-15-15’ Workout Is Great Cardio for the Easily Bored
Why the 15-15-15 is perfect if cardio bores you. If you get bored on cardio machines, a 45-minute workout is a pretty big ask ...
What Does ‘Cardio Fitness’ Really Mean?
Experts explain the best ways to measure your cardio fitness, plus the most important strategies for improvement.