So as not to overstress and reinjure the injury before healing has had a chance to begin.

Yes it can. If you are going to fast suck as diving at beyond the max speed for that aircraft it will overstress and most likely begin to tear itself apart.

Don't rush through your lessons, wear padding when sparring, never try to test out your skills by picking fights if you don't have much experience, and do not overstress your joints.

A; occasionally resistors short out especially at hi frequency hi voltage due to external contamination. But usually resistors open up or change to a hi value due to power overstress

Certain drugs, particularly fluoroquinolones, a class of antibiotics that includes the popular drug Cipro, can cause tendon rupture. Other than that, tendons usually tear due to overstress.