Gentle jog is Less tiring than a brisk walk London - Arabstoday If your 2012 health drive involves introducing regular power-walks to your exercise schedule, you might want to consider going jogging instead. A new study has found that a gentle run is actually less tiring - and is better for your muscles - than a brisk walk. This is because running at around two metres per second helps a 'car clutch' calf muscle to work more efficiently than it does when we’re walking briskly.   This more efficient movement helps the muscle release more momentum-boosting energy, which increases stamina levels. US researchers used ultrasound to scan the muscles of people on a treadmill to see how they behaved differently while walking or running.   This revealed how the medial gastrocnemius muscle attached to the Achilles tendon adjusted as volunteers walked and ran at various speeds.