When developing longevity is your priority over one-rep maxes and timed-run events, consider the three most important “organs” on which to focus your training: heart, lungs and legs. The combination ...

Your heart is a truly amazing organ. It has many interconnected parts, including muscular chambers, one-way valves, ...

Studies consistently show that high-intensity interval training is one of the fastest ways to raise VO₂ max. Short bursts of ...

Every part of your body needs oxygen to function properly. The main job of your respiratory system is to make sure that happens—it’s responsible for circulating fresh air throughout your body and ...