Surprise discovery
Training your good leg protects your injured leg
You just unlocked the cross-education effect. Exercises marked with it now show a purple badge.
The cross-education effectExercising one limb helps preserve strength in the other one, through the nervous system rather than the muscle itself. Your brain keeps the wiring to the injured side in practice.
Myokine shieldWorking muscles release myokines, signaling proteins that can dial down muscle-breakdown genes (FBOX32, TRIM63) throughout the body, including the immobilized leg.