Stretch them tennis means lengthen or widen them shoes tennis so not tightened, mainly when are new. Not to be confused with the expression quot; hang them tennis quot; whose meaning in Mexico is to die.
stretch the tennis is incorrectly written and it should be written as "Stretching the tennis." being its meaning: Verbal speech. Take a walk. Running. Doing sports. It is so called by a Synecdoche, change shoes for tennis. And stretch for move.