[header] How to stretch your quads (quadriceps ) [title] Walk or bike for 10 to 15 minutes. [step] A gentle cardio exercise such as walking or biking will get the blood flowing to your quads and make stretching more comfortable. Stretching cold muscles could result in injury. 
[substeps] If you're planning on exercising outside in cooler weather, add 5 to 10 minutes to your warm-up time before you start stretching. [title] Do standing quad stretches before a long run.