For fitness-minded folks, muscle testing can sound pretty intriguing. But it turns out that it has little to do with fitness...or even muscles. On a basic level, muscle testing looks at a muscle and ...

The wall-sit test is a simple yet powerful way to gauge lower-body endurance and reveal how well your heart copes with ...

Cardio fitness shows heart-lung strength, predicts longevity, and improves health at any age.